习题7-7 字符串替换 (15 分)

#include <stdio.h>
#include <stdlib.h>
int main() {
	char a[80];
	int i,len=0,cnt=0;
	char n[26]={'Z','Y','X','W','V','U','T','S','R','Q','P','O','N','M','L',
				'K','J','I','H','G','F','E','D','C','B','A'};           
	char c;
	c=getchar();
	while(c!='\n'){
		a[len]=c;
		len++;
		c=getchar();
	} 
	for(i=0;i<len;i++){
		if(a[i]>='A'&&a[i]<='Z'){
			a[i]=n[(int)a[i]-65];
			}
		else {	
		
		}
		
		printf("%c",a[i]);
	} 
	
    return 0;  
}