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C Exercises: Demonstrates the difference between predecrementing and postdecrementing using the decrement operator

C Basic Declarations and Expressions: Exercise-78 with Solution

Write a C program to demonstrates the difference between predecrementing and postdecrementing using the decrement operator --.

Sample Solution:

C Code:

#include<stdio.h>
int main()
{
    int x = 10;
    printf("Predecrementing:\n");
    printf("x   = %d\n", x);
    printf("x-- = %d\n", x--);
    printf("x   = %d\n\n", x);
    
    x = 10;
    printf("Postdecrementing:\n");
    printf("  x = %d\n", x);
    printf("--x = %d\n", --x);
    printf("  x = %d\n", x);
    
    return 0;
}

Sample Output:

Predecrementing:
x   = 10
x-- = 10
x   = 9

Flowchart:

C Programming Flowchart: Demonstrates the difference between predecrementing and postdecrementing using the decrement operator.

C programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP