#include "iostream.h"
#define N 7
int fun(char s[], char a, int n) {
int j;
j = n;
while (a < s[j] && j > 0) j--;
return j;
}
void main( ) {
char s[N + 1];
int k;
for (k = 1; k <= N; k++)
s[k] = 'A' + 2 * k + 1;
cout << fun(s, 'M', N) << endl;
} 输出： 1
