#include #include main(){
int i,j,num;
int j=1; printf("please enter one number:"); scanf("%d",&num);for(i=2;i<=int(sqrt(num));i++) {if(num%i==0) {
printf("%d is not one prime number",num);
j=0;/*若num不是素数,j=0,否则j不变*/
break;
} } if(j=1) printf("%d is one prime number",num);}"%"是求模运算,求余数。eg: 5%3=2;"/"除法
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