#include <stdio.h>
int letternum(char *str);
int main(void)
{
char a[100];
printf("Please input a string:"); printf("The number of letter is %d:",letternum
(a
)); return 0;
}
int letternum(char *str)
{
int num=0;
while ((*str)!='\0')
{
if ((*str>='a')&&(*str<='z')||(*str>='A')&&(*str<='Z'))
str++;
num++;
}
return num;
}
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