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  1.  
  2. //a program for infix to postfix
  3. #include<stdio.h>
  4. #include<string.h>
  5. char in[30],stack[20],out[30];
  6. int top=-1;
  7. int pop(char a);
  8. int output_push(char b);
  9. int push(char c);
  10. int precedence(char d);
  11. int main(){
  12.     int i,k,l,j=0;
  13.     printf("enter expression:");
  14.     fgets(in,sizeof(in),stdin);
  15.     for(i=0;i<=strlen(in);i++){
  16.         if(in[i]==(int)in[i]){
  17.             output_push(in[i]);}
  18.             if(in[i]!=(int)in[i]){
  19.                 push(in[i]);
  20.             }
  21.     }
  22.     printf("the output is:%s",out);
  23.  
  24. }
  25. int push(char c){
  26.     if(top==-1){
  27.     stack[++top]=c;}
  28.     else{
  29.         if(precedence(c)>precedence(stack[top])){
  30.             stack[++top]=c;
  31.         }
  32.         while(precedence(c)<=precedence(stack[top])){
  33.             int j;
  34.             out[++j]=stack[top--];
  35.         }
  36.     }
  37. }
  38. int output_push(char b){
  39.     int j;
  40.     out[++j]=b;
  41.  
  42. }
  43. int precedence(char d){
  44.     if(d=='+'||d=='-'){
  45.         return 1;
  46.     }
  47.     else if(d=='x'||d=='/'){
  48.         return 2;
  49.     }
  50. }
  51.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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2+3
stdout
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enter expression:the output is:
https://ideone.com/Uj3IOt
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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