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执行如下程序从键盘输入字符串“abcdefg”,则程序输出_____________. #include "stdio.h" #include "string.h" #define SIZE 100 void strchange(char str[]){ int n=strlen(str); if(n==0||n==1) return; else{ int i,j; for(i=0,j=n-1; i<=n/2-1; i++,j--){ char tmp; tmp=str[i]; str[i]=str[j]; str[j]=tmp; } } } int main(void ){ char str[SIZE]; scanf("%s",str); strchange(str); printf("%s\n",str); return 1; }