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Learn C the Hard Way Example 13

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ex13.c
C
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#include <stdio.h>
 
int main(int argc, char *argv[])
{
if(2 != argc)
{
printf("ERROR: You need one argument.\n");
return 1;
}
 
int i;
char letter;
for(i = 0, letter = argv[1][i]; '\0' != argv[1][i]; i++, letter = argv[1][i])
{
switch(letter)
{
case 'a':
case 'A':
printf("%d: 'A'\n", i);
break;
 
case 'e':
case 'E':
printf("%d: 'E'\n", i);
break;
 
case 'i':
case 'I':
printf("%d: 'I'\n", i);
break;
 
case 'o':
case 'O':
printf("%d: 'O'\n", i);
break;
 
case 'u':
case 'U':
printf("%d: 'U'\n", i);
break;
 
case 'y':
case 'Y':
if(i > 2)
printf("%d: 'Y'\n", i);
break;
default:
printf("%d: %c is not a vowel\n", i, letter);
break;
}
}
return 0;
}

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