3.1

 

#include<stdio.h> int main() {int i,s=0,j,m=20; for(i=1,j=22;i<=50;i++) {s=s+j; j=j+m;

} printf("s=%d\n",s); return 0; }

转载于:https://www.cnblogs.com/P201821430036/p/10838398.html