Write a C program to print first n prime numbers.
int main() {
int i, n, count = 0, data = 2, flag = 1;
/* get the input value n from the user */
printf("Enter the value for n:");
scanf("%d", &n);
/* print first n prime numbers */
printf("\nFirst %d prime numbers:\n", n);
while (count < n) {
for (i = 2; i <= data - 1; i++) {
if (data % i == 0) {
flag = 0;
break;
}
}
if (flag) {
printf("%5d", data);
count++;
if (count % 5 == 0)
printf("\n");
}
data++, flag = 1;
}
return 0;
}
Output:
jp@jp-VirtualBox:~/$ ./a.out
Enter the value for n:100
First 100 prime numbers:
2 3 5 7 11
13 17 19 23 29
31 37 41 43 47
53 59 61 67 71
73 79 83 89 97
101 103 107 109 113
127 131 137 139 149
151 157 163 167 173
179 181 191 193 197
199 211 223 227 229
233 239 241 251 257
263 269 271 277 281
283 293 307 311 313
317 331 337 347 349
353 359 367 373 379
383 389 397 401 409
419 421 431 433 439
443 449 457 461 463
467 479 487 491 499
503 509 521 523 541
Enter the value for n:100
First 100 prime numbers:
2 3 5 7 11
13 17 19 23 29
31 37 41 43 47
53 59 61 67 71
73 79 83 89 97
101 103 107 109 113
127 131 137 139 149
151 157 163 167 173
179 181 191 193 197
199 211 223 227 229
233 239 241 251 257
263 269 271 277 281
283 293 307 311 313
317 331 337 347 349
353 359 367 373 379
383 389 397 401 409
419 421 431 433 439
443 449 457 461 463
467 479 487 491 499
503 509 521 523 541
This code is correct ?Prime Number Program in C
ReplyDelete#include
#include
void main()
{
int num,res=0;
clrscr();
printf("\nENTER A NUMBER: ");
scanf("%d",&num);
res=prime(num);
if(res==0)
printf("\n%d is a prime number",num);
else
printf("\n%d is not a prime number",num);
getch();
}
int prime(int n)
{
int i;
for(i=2;i<=n/2;i++)
{
if(n%i!=0)
continue;
else
return 1;
}
return 0;
}