Frequently asked C Language Programs in interview

1.Find out the perfect number using c program

2.WAP to find given number is armstrong number or not using c program

3.WAP to given number is prime number or not

4.Write a c program to check given number is strong number or not.

5.Write A C program for odd or even number

6.Write a c program to check given number is palindrome number or not.

7.Write a c program to solve quadratic equation.

8.Write a c program to print Fibonacci series of given range.

9.Write a c program to find factorial of a number

10.Write a c program for Floyd’s triangle.

 11.Write a c program to generate multiplication table.

12.Write a c program to print ASCII value of all characters. 

13.Write a c program which produces its own source code as its output

Write a c program which produces its own source code as its output

How do you write a program which produces its own source code as its output in c language?

#include<stdio.h>

int main(){

    FILE *fp;

    char c;

    fp = fopen(__FILE__,"r");

 

    do{

         c= getc(fp);

         putchar(c);

    }

    while(c!=EOF);

    fclose(fp);

   

    return 0;

}

Output:

#include<stdio.h>

int main(){

    FILE *fp;

    char c;

    fp = fopen(__FILE__,"r");

 

    do{

         c= getc(fp);

         putchar(c);

    }

    while(c!=EOF);

    fclose(fp);

   

    return 0;

}

Write a c program to print ASCII value of all characters.

C code for ASCII table

C program to display ASCII values

#include<stdio.h>

int main(){

  

    int i;

  

    for(i=0;i<=255;i++)

         printf("ASCII value of character %c: %d\n",i,i);

    return 0;

}

Output:

ASCII value of character  : 0

ASCII value of character ☺: 1

ASCII value of character ☻: 2

ASCII value of character ♥: 3

ASCII value of character ♦: 4

ASCII value of character ♣: 5

ASCII value of character ♠: 6

ASCII value of character : 7

ASCII value of character: 8

ASCII value of character        :

ASCII value of character

: 10

ASCII value of character ♂: 11

ASCII value of character ♀: 12

: 13I value of character

ASCII value of character ♫: 14

ASCII value of character ☼: 15

ASCII value of character ►: 16

ASCII value of character ◄: 17

ASCII value of character ↕: 18

ASCII value of character ‼: 19

ASCII value of character ¶: 20

ASCII value of character §: 21

ASCII value of character ▬: 22

ASCII value of character ↨: 23

ASCII value of character ↑: 24

ASCII value of character ↓: 25

ASCII value of character →: 26

ASCII value of character ←: 27

ASCII value of character ∟: 28

ASCII value of character ↔: 29

ASCII value of character ▲: 30

ASCII value of character ▼: 31

ASCII value of character  : 32

ASCII value of character !: 33

ASCII value of character ": 34

ASCII value of character #: 35

ASCII value of character $: 36

ASCII value of character %: 37

ASCII value of character &: 38

ASCII value of character ': 39

ASCII value of character (: 40

ASCII value of character ): 41

ASCII value of character *: 42

ASCII value of character +: 43

ASCII value of character ,: 44

ASCII value of character -: 45

ASCII value of character .: 46

ASCII value of character /: 47

ASCII value of character 0: 48

ASCII value of character 1: 49

ASCII value of character 2: 50

ASCII value of character 3: 51

ASCII value of character 4: 52

ASCII value of character 5: 53

ASCII value of character 6: 54

ASCII value of character 7: 55

ASCII value of character 8: 56

ASCII value of character 9: 57

ASCII value of character :: 58

ASCII value of character ;: 59

ASCII value of character <: 60

ASCII value of character =: 61

ASCII value of character >: 62

ASCII value of character ?: 63

ASCII value of character @: 64

ASCII value of character A: 65

ASCII value of character B: 66

ASCII value of character C: 67

ASCII value of character D: 68

ASCII value of character E: 69

ASCII value of character F: 70

ASCII value of character G: 71

ASCII value of character H: 72

ASCII value of character I: 73

ASCII value of character J: 74

ASCII value of character K: 75

ASCII value of character L: 76

ASCII value of character M: 77

ASCII value of character N: 78

ASCII value of character O: 79

ASCII value of character P: 80

ASCII value of character Q: 81

ASCII value of character R: 82

ASCII value of character S: 83

ASCII value of character T: 84

ASCII value of character U: 85

ASCII value of character V: 86

ASCII value of character W: 87

ASCII value of character X: 88

ASCII value of character Y: 89

ASCII value of character Z: 90

ASCII value of character [: 91

ASCII value of character \: 92

ASCII value of character ]: 93

ASCII value of character ^: 94

ASCII value of character _: 95

ASCII value of character `: 96

ASCII value of character a: 97

ASCII value of character b: 98

ASCII value of character c: 99

ASCII value of character d: 100

ASCII value of character e: 101

ASCII value of character f: 102

ASCII value of character g: 103

ASCII value of character h: 104

ASCII value of character i: 105

ASCII value of character j: 106

ASCII value of character k: 107

ASCII value of character l: 108

ASCII value of character m: 109

ASCII value of character n: 110

ASCII value of character o: 111

ASCII value of character p: 112

ASCII value of character q: 113

ASCII value of character r: 114

ASCII value of character s: 115

ASCII value of character t: 116

ASCII value of character u: 117

ASCII value of character v: 118

ASCII value of character w: 119

ASCII value of character x: 120

ASCII value of character y: 121

ASCII value of character z: 122

ASCII value of character {: 123

ASCII value of character |: 124

ASCII value of character }: 125

ASCII value of character ~: 126

ASCII value of character ⌂: 127

ASCII value of character Ç: 128

ASCII value of character ü: 129

ASCII value of character é: 130

ASCII value of character â: 131

ASCII value of character ä: 132

ASCII value of character à: 133

ASCII value of character å: 134

ASCII value of character ç: 135

ASCII value of character ê: 136

ASCII value of character ë: 137

ASCII value of character è: 138

ASCII value of character ï: 139

ASCII value of character î: 140

ASCII value of character ì: 141

ASCII value of character Ä: 142

ASCII value of character Å: 143

ASCII value of character É: 144

ASCII value of character æ: 145

ASCII value of character Æ: 146

ASCII value of character ô: 147

ASCII value of character ö: 148

ASCII value of character ò: 149

ASCII value of character û: 150

ASCII value of character ù: 151

ASCII value of character ÿ: 152

ASCII value of character Ö: 153

ASCII value of character Ü: 154

ASCII value of character ¢: 155

ASCII value of character £: 156

ASCII value of character ¥: 157

ASCII value of character ₧: 158

ASCII value of character ƒ: 159

ASCII value of character á: 160

ASCII value of character í: 161

ASCII value of character ó: 162

ASCII value of character ú: 163

ASCII value of character ñ: 164

ASCII value of character Ñ: 165

ASCII value of character ª: 166

ASCII value of character º: 167

ASCII value of character ¿: 168

ASCII value of character ⌐: 169

ASCII value of character ¬: 170

ASCII value of character ½: 171

ASCII value of character ¼: 172

ASCII value of character ¡: 173

ASCII value of character «: 174

ASCII value of character »: 175

ASCII value of character ░: 176

ASCII value of character ▒: 177

ASCII value of character ▓: 178

ASCII value of character │: 179

ASCII value of character ┤: 180

ASCII value of character ╡: 181

ASCII value of character ╢: 182

ASCII value of character ╖: 183

ASCII value of character ╕: 184

ASCII value of character ╣: 185

ASCII value of character ║: 186

ASCII value of character ╗: 187

ASCII value of character ╝: 188

ASCII value of character ╜: 189

ASCII value of character ╛: 190

ASCII value of character ┐: 191

ASCII value of character └: 192

ASCII value of character ┴: 193

ASCII value of character ┬: 194

ASCII value of character ├: 195

ASCII value of character ─: 196

ASCII value of character ┼: 197

ASCII value of character ╞: 198

ASCII value of character ╟: 199

ASCII value of character ╚: 200

ASCII value of character ╔: 201

ASCII value of character ╩: 202

ASCII value of character ╦: 203

ASCII value of character ╠: 204

ASCII value of character ═: 205

ASCII value of character ╬: 206

ASCII value of character ╧: 207

ASCII value of character ╨: 208

ASCII value of character ╤: 209

ASCII value of character ╥: 210

ASCII value of character ╙: 211

ASCII value of character ╘: 212

ASCII value of character ╒: 213

ASCII value of character ╓: 214

ASCII value of character ╫: 215

ASCII value of character ╪: 216

ASCII value of character ┘: 217

ASCII value of character ┌: 218

ASCII value of character █: 219

ASCII value of character ▄: 220

ASCII value of character ▌: 221

ASCII value of character ▐: 222

ASCII value of character ▀: 223

ASCII value of character α: 224

ASCII value of character ß: 225

ASCII value of character Γ: 226

ASCII value of character π: 227

ASCII value of character Σ: 228

ASCII value of character σ: 229

ASCII value of character µ: 230

ASCII value of character τ: 231

ASCII value of character Φ: 232

ASCII value of character Θ: 233

ASCII value of character Ω: 234

ASCII value of character δ: 235

ASCII value of character ∞: 236

ASCII value of character φ: 237

ASCII value of character ε: 238

ASCII value of character ∩: 239

ASCII value of character ≡: 240

ASCII value of character ±: 241

ASCII value of character ≥: 242

ASCII value of character ≤: 243

ASCII value of character ⌠: 244

ASCII value of character ⌡: 245

ASCII value of character ÷: 246

ASCII value of character ≈: 247

ASCII value of character °: 248

ASCII value of character ∙: 249

ASCII value of character ·: 250

ASCII value of character √: 251

ASCII value of character ⁿ: 252

ASCII value of character ²: 253

ASCII value of character ■: 254

ASCII value of character  : 255

Write a c program to generate multiplication table.

1. Multiplication tables in c program

2. Write a c program to print multiplication table

3. Code for multiplication table in c

4. Multiplication table in c language

5. Write a c program to print multiplication table

#include<stdio.h>

int main(){

  int r,i,j,k;

  printf("Enter the number range: ");

  scanf("%d",&r);

  for(i=1;i<=r;i++){

      for(j=1;j<=10;j++)

           printf("%d*%d=%d ",i,j,i*j);

      printf("\n");

  }

  return 0;

}

Sample Output:

Enter the number range: 5

1*1=1 1*2=2 1*3=3 1*4=4 1*5=5 1*6=6 1*7=7 1*8=8 1*9=9 1*10=10

2*1=2 2*2=4 2*3=6 2*4=8 2*5=10 2*6=12 2*7=14 2*8=16 2*9=18 2*10=20

3*1=3 3*2=6 3*3=9 3*4=12 3*5=15 3*6=18 3*7=21 3*8=24 3*9=27 3*10=30

4*1=4 4*2=8 4*3=12 4*4=16 4*5=20 4*6=24 4*7=28 4*8=32 4*9=36 4*10=40

5*1=5 5*2=10 5*3=15 5*4=20 5*5=25 5*6=30 5*7=35 5*8=40 5*9=45 5*10=50

Write a c program for Floyd’s triangle.

1. Write a c program to print Floyd’s triangle

2. C program to display Floyd’s triangle

3. How to print Floyd’s triangle in c

#include<stdio.h>

int main(){

  int i,j,r,k=1;

  printf("Enter the range: ");

  scanf("%d",&r);

  printf("FLOYD'S TRIANGLE\n\n");

  for(i=1;i<=r;i++){

      for(j=1;j<=i;j++,k++)

           printf(" %d",k);

      printf("\n");

  }

  return 0;

}

Sample output:

Enter the range: 10

FLOYD'S TRIANGLE

 1

 2 3

 4 5 6

 7 8 9 10

 11 12 13 14 15

 16 17 18 19 20 21

 22 23 24 25 26 27 28

 29 30 31 32 33 34 35 36

 37 38 39 40 41 42 43 44 45

 46 47 48 49 50 51 52 53 54 55

---

What is Floyd’s triangle?

Definition of floyd's triangle:

Floyd's triangle is a right angled-triangle using the natural numbers. Examples of floyd's triangle:

Example 1:

1

2 3

4 5 6

7 8 9 10

Example 2:

1

2   3

4   5   6

7   8   9   10

11  12  13  14  15

16  17  18  19  20 21