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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "stack.h"
int main(int argc, char **argv){
stack *s = initstack(0, 64);
char in[128] = {0};
if (argc > 1){
for (int i = 1; i < argc; i++){
strcat(in, argv[i]);
strcat(in, " ");
}
} else fgets(in, 128, stdin);
for (int i = 0; i < 128; i++) if (in[i] == '\n') in[i] = '\0';
fflush(stdin);
int r;
int a;
int b;
char *tok = strtok(in, " ");
while (tok != NULL){
switch (tok[0]) {
case '+':
a = s->pop(s);
b = s->pop(s);
s->push(s, b+a);
break;
case '-':
a = s->pop(s);
b = s->pop(s);
s->push(s, b-a);
break;
case '*':
a = s->pop(s);
b = s->pop(s);
s->push(s, b*a);
break;
case '/':
a = s->pop(s);
b = s->pop(s);
s->push(s, b/a);
break;
case '^':
a = s->pop(s);
b = s->pop(s);
s->push(s, pow(b, a));
break;
case '.':
r = s->pop(s);
printf("%d\n", r);
break;
default:
s->push(s, atoi(tok));
break;
}
tok = strtok(NULL, " ");
if (tok == NULL){
r = s->pop(s);
printf("%d\n", r);
break;
}
}
s->free(s);
return 0;
}
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