#include <stdio.h> #include <string.h> //保留字母 int main() { int i,len; char str[90];//定义一个字符数组 scanf("%s",str); len = strlen(str); for(i=0;i<len;i++) { if(str[i]<='Z' && str[i]>='A') printf("%c",str[i]); else if(str[i]<='z' && str[i]>='a') printf("%c",str[i]); } return 0; } |
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