用for#include<stdio.h>void main(){ int i,sum=0; for(i=1;i<=100;i++) sum=sum+i; printf("1+2+3+.....+100=%d\n",sum);} 用while#include<stdio.h>void main(){ int i=1,sum=0; while(i<=100) { sum=sum+i; i++; }printf("1+2+3+....+100=%d\n",sum);}用do-while#include<stdio.h>void main(){ int i=1,sum=0; do { sum=sum+i; i++; }while(i<=100)printf("1+2+3+....+100=%d\n",sum);}
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