对于输入的每个字符串，查找其中的最大字母(大小写形式认为一样大)，在该字母后面插入字符串“(max)”。

 1 #include <stdio.h>
 2 int main(){
 3     int n;
 4     int i;
 5     char max,max2;
 6     char a[100];
 7
 8     while(gets(a)){
 9         i = 0;
10         max = a[0];
11         while(a[i] != '\0'){
12             if(a[i] >= 'A' && a[i] <= 'Z'){
13                 if(max < a[i]+32){
14                     max = a[i]+32;
15                 }
16             }else{
17                 if(max < a[i]){
18                     max = a[i];
19                 }
20             }
21             i++;
22         }
23         i = 0;
24         max2 = max - 32;
25         while(a[i] != '\0'){
26             printf("%c",a[i]);
27             if(a[i] == max || a[i] == max2)
28                 printf("(max)");
29             i++;
30         }
31         printf("\n");
32     }
33     return 0;
34 }

 1 #include <stdio.h>
 2 int main(){
 3     int n;
 4     int i;
 5     char max,max2;
 6     char a[100];
 7
 8     while(gets(a)){
 9         i = 0;
10         max  = 'a';
11         max2 = 'A';
12         while(a[i] != '\0'){
13             if(a[i] > max){
14                 max  = a[i];
15                 max2 = a[i] - 32;
16             }else if(a[i] > max2 && a[i] < 'Z'){   // 这里很坑，可能会出现 max = g，max2 = G，a[i] = b;此时仍会进入else if然后就崩了。。所以一定要限制a[i]的范围
17                 max2 = a[i];
18                 max  = a[i] + 32;
19             }
20             i++;
21         }
22         i = 0;
23         while(a[i] != '\0'){
24             printf("%c",a[i]);
25             if(a[i] == max || a[i] == max2)
26                 printf("(max)");
27             i++;
28         }
29         printf("\n");
30     }
31     return 0;
32 }