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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<ctype.h>
  4. #include<string.h>
  5.  
  6. int stack[10],sp=0;
  7.  
  8. int pop(void);
  9. void push(int n);
  10.  
  11. int main() {
  12.     char siki[80];
  13.     char *p;
  14.     int v1, v2;
  15.     printf("input:");
  16.     fgets(siki, 80, stdin);
  17.  
  18.     p = strtok(siki, " ");
  19.     push(atoi(p)); //    stack[sp] = atoi(p);
  20.     //             //    sp++;
  21.     while(p) {
  22.         printf("%s\n", p);
  23.         p = strtok(NULL, " ");
  24.         if(p == NULL) {
  25.             break;
  26.         }
  27. //        else {
  28. //           stack[sp] = atoi(p);
  29. //            sp++;
  30. //        }
  31.         if (*p == '+') {
  32.             v1 = pop();
  33.             v2 = pop();
  34.             push(v2 + v1);
  35.         }
  36.         else if (*p == '-') {
  37.             v1 = pop();
  38.             v2 = pop();
  39.             push(v2 - v1);
  40.         }
  41.         else if (*p == '*') {
  42.             v1 = pop();
  43.             v2 = pop();
  44.             push(v2 * v1);
  45.         }
  46.         else if (*p == '/') {
  47.             v1 = pop();
  48.             v2 = pop();
  49.             push(v2 / v1);
  50.         }
  51.         else {
  52.             push(atoi(p));
  53.         }
  54.     }
  55.  
  56.     int ans = stack[0];
  57.     printf("%d\n", ans);
  58.  
  59.     return 0;
  60. }
  61.  
  62. int pop(void)
  63. {
  64.     return stack[--sp];
  65. }
  66.  
  67. void push(int n)
  68. {
  69.     stack[sp++] = n;
  70. }
  71.  
Success #stdin #stdout 0s 4844KB
comments (?)
stdin
copy 
5 4 + 3 - 2 * 1 /
stdout
copy 
input:5
4
+
3
-
2
*
1
/
12
https://ideone.com/xzbCPr
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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