代ç
#include<stdio.h>
void main(){
char a[50],*p;
int ch;
int n2=0,n4=0,n6=0,n8=0;
printf("please enter the string:");
scanf("%s",a);
for(p=a;*p!='\0';p++)
{ch=*p;
switch(ch)
{case 'a':
case 'A':n2++;break;
case 'b':
case 'B':n4++;break;
case 'c':
case 'C':n6++;break;
case 'd':
case 'D':n8++;break;}
}
printf("a:%d\n",n2);
printf("b:%d\n",n4);
printf("c:%d\n",n6);
printf("d:%d\n",n8);
}
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