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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. int postf(char*);
  4. int priority(char);
  5.  
  6. int main()
  7. {
  8.     int a,b;
  9.     char in[100];
  10.     scanf("%d",&a);
  11.     for(b=1;b<=a;b++){
  12.  
  13.     scanf("%s",in);
  14.  
  15.     postf(in);
  16.     }
  17. }
  18. int postf(char* fix) {
  19.     int i = 0, top = 0;
  20.     char stack[100]={'\0'};
  21.     char op;
  22.  
  23.     while(1) {
  24.  
  25.         op=fix[i];
  26.  
  27.      switch(op) {
  28.             case '\0':
  29.             printf(" ");
  30.                 while(top > 0) {
  31.                     printf("%c", stack[top]);
  32.                     top--;
  33.                 }
  34.  
  35.                 printf("\n");
  36.                 return 0;
  37.  
  38.             case '(':
  39.                 if(top<(sizeof(stack) / sizeof(char))) {
  40.                     top++;
  41.                     stack[top]=op;
  42.                 }
  43.                 break;
  44.             case '+':
  45.             case '-':
  46.             case '*':
  47.             case '/':
  48.                 printf(" ");
  49.                 while(priority(stack[top]) >= priority(op)) {
  50.                     printf("%c ", stack[top]);
  51.                     top--;
  52.                 }
  53.  
  54.                 if(top < (sizeof(stack) / sizeof(char))) {
  55.                     top++;
  56.                     stack[top] = op;
  57.                 }
  58.                 break;
  59.  
  60.             case ')':
  61.                 while(stack[top] != '(') {
  62.                     printf("%c",stack[top]);
  63.                     top--;
  64.                 }
  65.                 top--;
  66.                 break;
  67.             default:
  68.                 printf("%c",op);
  69.  
  70.  
  71.                 break;
  72.  
  73. }
  74.  
  75.         i++;
  76.  
  77.  
  78.     }
  79.  
  80.  
  81. }
  82.  
  83. int priority(char op) {
  84.     int a;
  85.  
  86.     switch(op) {
  87.  
  88.         case '+':
  89.         case '-':
  90.             a = 1;
  91.             break;
  92.  
  93.         case '*':
  94.         case '/':
  95.             a = 2;
  96.             break;
  97.  
  98.         default:
  99.             a = 0;
  100.             break;
  101.     }
  102.  
  103.     return a;
  104. }
  105.  
Success #stdin #stdout 0s 2008KB
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https://ideone.com/6twgyk
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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