我不太明白楼主的意思，我根据你的题目编的这个程序，应该能帮到你#includevoid main(){int a,b,n;printf("输入一个大于0小于等于20的数");scanf("%d",&n);printf("____+_____=%d\n",n);for(a=0;a#include void main(void){ int n, i, done = 0; do {
printf("Enter a number n (0<n<=20): ");
scanf("%d", &n);
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