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postfix 수정 #15

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postfix 수정 #15

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20 changes: 13 additions & 7 deletions PBL_1_ver-5
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Original file line number Diff line number Diff line change
Expand Up @@ -354,8 +354,10 @@ int precedence(int op) {
else return 3;
}
int postfix(char *dst, char *src) {
int count =0, max =0;
// operator 다음에 '-' 면 다음 숫자가 operator
int count =0, max =0, op;
init_stack();
if(*src++ == '-') *dst++ = '-'; // 맨 처음 input이 '-'면 음수로 처리
while (*src) {
if (*src == '(') {
push(*src);
Expand All @@ -370,13 +372,17 @@ int postfix(char *dst, char *src) {
src++;
}
else if (is_operator(*src)) {
while (!is_empty() &&
precedence(get_top()) >= precedence(*src)) {
*dst++ = pop();
*dst++ = ' ';
op = *src;
while(isblank(*src)) src++;
if(*src++ == '-') *dst++ = '-';
else{
while (!is_empty() &&
precedence(get_top()) >= precedence(op)) {
*dst++ = pop();
*dst++ = ' ';
}
push(op);
}
push(*src);
src++;
}
else if (*src >= '0' && *src <= '9' || *src == '.') {
do {
Expand Down