习题3-28

#include <stdio.h>#include <ctype.h>int main(){ char a[10]; int i; char c;printf("请输入十个字符:");for(i=0;i<=9;i++){scanf("%c",&a[i]);}for(i=0;i<=9;i++){if(a[i]>='0'&&a[i]<='9'){printf("%c",a[i]);}if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z')){a[i]=toupper(a[i]);printf("%c",a[i]);}}printf("\n");return 0;}