How do I write a prime program in C?

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Rishi Yadav

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void main() { int n,i,p=0,flag=0; clrscr(); printf("Enter the number to check prime:"); scanf("%d",&n); p=n/2; for(i=2;i<=p;i++) { if(n%i==0) { printf("Number is not prime"); flag=1; break; } } if(flag==0) printf("Number is prime"); getch(); }
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void main() { int n,i, count=1; printf ("Enter a number which is greater than one \n"); scanf ("%d",&n); for(i =2; i
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u can iterate to till the half of the number so that the number of iterations are less...because anyways over half of number it cant be divisible by it...e.g if we cansider number as 18..THE MAX NUMBER IT CAN BE DIVISIBLE WITH IS 9.not more than that
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