int main(){ char a[100]; PRintf(“輸入字符串a: /n”); scanf(“%s/n”,a); int num = (int)strlen(a); for(int i = 0; i < (num/2);i ++) { if(a[i] != a[num-1-i]) { printf(“a不是回文/n”); return 0; } } printf(“a是回文/n”); return 0; }