Pointer and Flow Control

Conditional Statement

Check Odd or Even Number

#include<stdio.h>
int main(){
    int a = 10;
    int *p = &a;
    
    // a = 15;
    // if( a % 2 == 0 ){
    if( (*p) % 2 == 0 ){
        printf("Even Number\n");
    }
    else{
        printf("Odd Number\n");
    }

    return 0;
}

Check Vote Eligibility

#include<stdio.h>
int main(){
    int age = 21;
    int *p = &age;
    
    //*p = 15;
    
    //if(a>=18){
    if(*p>=18){
        printf("Voter\n");
    }
    else{
        printf("Not Voter\n");
    }

    return 0;
}

Find Maximum Between Two Numbers

#include<stdio.h>
int main(){
    int a = 10, b = 20;
    int *p = &a, *q = &b;

    /*
    // Finding Maximum using Variable
    if(a > b){
        printf("Maximum : %d\n", a);
    }else{
        printf("Maximum : %d\n", b);
    }
    */

    // Finding Maximum using Pointer
    if(*p > *q){
        printf("Maximum : %d\n", *p);
    }else{
        printf("Maximum : %d\n", *q);
    }

    return 0;
}

Loop Statement

Print Natural Number from 1 to N

#include<stdio.h>
int main(){
    int a = 0, b = 10;
    int *p = &a, *q = &b;
    
    /*
    // Printing Natural Number Series from 1 to 10 using Variable
    for(a=1; a<=b; a++){
        printf("%d ", a);
    }
    printf("\n");
    */
    
    // Printing Natural Number Series from 1 to 10 using Pointer
    for(*p=1; *p<=*q; (*p)++){
        printf("%d ", *p);
    }
    printf("\n");
    
    return 0;
}

Summation of Natural Number from 1 to N

#include<stdio.h>
int main(){
    int a = 0, b = 10, c = 0;
    int *p = &a, *q = &b, *r = &c;
    
    /*
    // Summation of Natural Number Series from 1 to 10 using Variable
    c = 0;
    for(a=1; a<=b; a++){
        c = c + a; //c += a;
    }
    printf("%d\n", c);
    */
    
    // Summation of Natural Number Series from 1 to 10 using Pointer
    *r = 0;
    for(*p=1; *p<=*q; (*p)++){
        *r = *r + *p;
        //*r += *p
    }
    printf("%d\n", *r);
    
    return 0;
}