>>972
int main () {
int i;
char str[] = "abcdef";

for (i = 0; i < sizeof(str)/sizeof(char); ++i)
switch (str[i]) {
case 'a':
str[i] = 'A';
break;
case 'b':
str[i] = 'B';
break;
case 'c':
str[i] = 'C';
break;
case 'd':
str[i] = 'D';
break;
case 'e':
str[i] = 'E';
break;
case 'f':
str[i] = 'F';
break;
}
printf("%s\n", str);
}