Added Postfix To Infix in C and C++ (#992)

Postfix_To_Infix/Postfix_To_Infix.c

@@ -0,0 +1,66 @@
+# include <stdio.h>
+# include <stdlib.h>
+# include <string.h>
+# include <stdbool.h>
+
+char stack[20];
+int top = -1;
+
+//Pop the top value from the stack.
+char pop()
+{
+    return stack[top--];
+}
+
+//Push it onto the stack.
+void push(char ch)
+{
+    stack[++top] = ch;
+}
+
+//Checking if it is operator or letter
+bool operand(char x)
+{
+    if(x == '+' || x == '-' || x == '*'|| x == '/')
+        return true;
+    return false;
+}    
+
+void postfix_to_infix(char postfix[])
+{
+    int length;
+    char element, operator;
+    length = strlen(postfix);
+    printf("\nInfix Expression: ");
+    printf("%c", postfix[0]);
+    for(int count = 1; count < length; count++)
+    {   
+        // If the character is not an operand.
+        if(!operand(postfix[count]))
+        { 
+             //If the character is letter , push it in the stack
+             push(postfix[count]);     
+        }
+        else
+        {
+            //pop the element present in the stack
+            element = pop(); 
+            //character is assigned to operator
+            operator = postfix[count];
+            printf(" %c %c", operator, element);            
+        }
+    }    
+}
+
+int main()
+{
+    char postfix[20];
+    printf("Enter Postfix Expression: ");
+    scanf("%s", postfix);
+    postfix_to_infix(postfix);      
+    return 0;
+}    
+
+/*
+Enter Postfix Expression: ab*c+
+Infix Expression: a * b + c*/

Postfix_To_Infix/Postfix_To_Infix.cpp

@@ -0,0 +1,64 @@
+# include <iostream>
+# include <cstring>
+using namespace std;
+
+char stack[20];
+int top = -1;
+
+//Pop the top value from the stack.
+char pop()
+{
+    return stack[top--];
+}
+
+//Push it onto the stack.
+void push(char ch)
+{
+    stack[++top] = ch;
+}
+
+//Checking if it is operator or letter
+bool operand(char x)
+{
+    if(x == '+' || x == '-' || x == '*'|| x == '/')
+        return true;
+    return false;
+}
+
+void postfix_to_infix(char postfix[])
+{
+    int length;
+    char element,operators;
+    length = strlen(postfix);
+    cout << "\nInfix Expression: ";
+    cout << postfix[0];
+    for(int count = 1; count < length; count++)
+    {   
+        // If the character is not an operand.
+        if(!operand(postfix[count]))
+        {
+            //If the character is letter , push it in the stack
+            push(postfix[count]); 
+        }
+        else
+        {
+            //pop the element present in the stack
+            element = pop(); 
+            //character is assigned to operator
+            operators = postfix[count]; 
+            cout << operators << element ;
+        }
+    }    
+}
+
+int main()
+{
+    char postfix[20];
+    cout << "Enter Postfix Expression: ";
+    cin >> postfix;
+    postfix_to_infix(postfix);      
+    return 0;
+}
+
+/*Enter Postfix Expression: ab*c+
+Infix Expression: a*b+c */