#include stdioh#include stringhvoid insertchar str int i = 0; for i = 0;stri != 0; ++i stri = ; stri = 0; int main char s1100 = abc; inserts1; putss1;字符串加空格怎么改？

可以将原来的循环改为在每个字符后面加上一个空格，最后再在字符串末尾加上一个空字符即可：

void insert(char str[]){ int i = 0; for (i = 0; str[i] != '\0'; ++i) { str[i] = ' '; str[i+1] = str[i]; } str[i] = '\0'; }