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- /* C program to check whether a number is prime or not. */
- #include <stdio.h>
- int main()
- {
- int n, i, flag=0;
- printf("Enter a positive integer: ");
- scanf("%d",&n);
- for(i=2;i<=n/2;++i)
- {
- if(n%i==0)
- {
- flag=1;
- break;
- }
- }
- if (flag==0)
- printf("%d is a prime number.",n);
- else
- printf("%d is not a prime number.",n);
- return 0;
- }
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