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- #include<stdio.h>
- int main()
- {
- int a;
- b:printf("enter a number=");
- scanf("%d", &a);
- if(a==1){
- printf("not prime number.\n\n");
- goto b;
- // getch();
- }
- int f=0;
- int i;
- for(i=2;i*i<=a;i++){
- if(a%i==0){
- f=1;
- break;
- }
- }
- if(f==0) printf("prime number.\n\n");
- else printf("not prime number.\n\n");
- goto b;
- // getch();
- return 0;
- }
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