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Solved Examples · Example 11

Q.Write a C program to illustrate the logical ANDing and ORing operations.
#include<stdio.h>  
void main()  
{  
    int a, b, c;  
    a=5, b=4;  
    c=a&&b;  
    b=a||b||c;  
    a=a&&b||c;  
    printf("%d, %d, %d", a,b,c);  
}  

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[!TLDR]

Logical && and || return 1 for true and 0 for false; because a, b and c are all non-zero throughout, each assignment stores 1.

A logical operator regards any non-zero operand as true and zero as false, and produces 1 (true) or 0 (false). Tracing the program with a = 5 and b = 4:

  • c = a && b; : 5 && 4 — both operands non-zero, so c = 1.
  • b = a || b || c; : 5 || 4 || 1 — at least one operand is non-zero, so b = 1.
  • a = a && b || c; : here && has higher precedence than ||, so it is (5 && 1) || 1 = 1 || 1 = 1, so a = 1.

Finally printf displays a, b, c. A complete standard version is:

#include <stdio.h>

int main(void)
{
    int a, b, c;
    a = 5, b = 4;
    c = a && b; …

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