수다닷컴

질문 제목 : -48인 이유는?-48인 이유는?질문 내용 :

#include stdio.h

#define end_if }
#define end_else }
#define end_for }
#define end_switch }
#define end_while }

int a[ 100 ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9,
2, 4, 6, 8, 10, 12, 14, 16, 18,
3, 6, 9, 12, 15, 18, 21, 24, 27,
4, 8, 12, 16, 20, 24, 28, 32, 36,
5, 10, 15, 20, 25, 30, 35, 40, 45,
6, 12, 18, 24, 30, 36, 42, 48, 54,
7, 14, 21, 28, 35, 42, 49, 56, 63,
8, 16, 24, 32, 40, 48, 56, 64, 72,
9, 18, 27, 36, 45, 54, 63, 72, 81};

int main()
{
char a[ 100 ];
int i, len, sum = 0;

printf (숫자를 입력하세요 :);
scanf (%s, a);

len = 0;
while( 1 ) {
if( a[ len ] == 0 ) break;
len++;
}

printf (입력된 개수 : %d\n, len);

for( i = 0; i len; i++ ) {
sum += a[ a[i] - 48 ];
end_for
printf (result = %d\n, sum);
}

-48인 이유는 왜죠??

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