C Programming : Decision Making Statements (BIM-TU) 2024

In this article, We will learn writing a program using decision making statement. We will learn to use if else statements and switch case.

Write a program to input a number and check whether it is odd or even.

#include<stdio.h>
int main()
{
    int a;
    printf("Enter a number : ");
    scanf("%d",&a);
    if (a%2==0)
    {
        printf("Even");
    }
    else
    {
        printf("Odd");
    }
    return 0;
}

Enter a number : 5
Odd

2. Write a program to input 3 numbers and find the middle number.

#include<stdio.h>
int main()
{
    float a,b,c;
    printf("Enter any three numbers : ");
    scanf("%f%f%f",&a,&b,&c);
    if (a>b && a<c || a<b && a>c)
    {
        printf("Middle Number : %f",a);
    }
    else if (b>a && b<c || b<a && b>c)
    {
        printf("Middle Number : %f",b);
    }
    else
    {
        printf("Middle Number : %f",c);
    }
    return 0;
}

Enter any three numbers : 5 4 3
Middle Number : 4.000000

3. Write a program to input electricity units and find the billing amount as follows:

Electricity Units	Price Per Unit
For First 20 Units	Rs. 0
For Next 100 Units	Rs. 12
For Next 100 Units	Rs. 11
For Above 220 Units	Rs. 10

#include<stdio.h>
int main()
{
    int unit,amt;
    printf("Enter the electricity units consumed : ");
    scanf("%d",&unit);
    if (unit<=20)
    {
        amt=0;
    }
    else if (unit<=120)
    {
        amt=0+12*(unit-20);
    }
    else if (unit<=220)
    {
        amt=0+12*100+11*(unit-120);
    }
    else
    {
        amt=0+12*100+11*100+10*(unit-220);
    }
    printf("Total Billing Amount : Rs. %d",amt);
    return 0;
}

Enter the electricity units consumed : 235
Total Billing Amount : Rs. 2450

4. Write a program to check vowel / consontant.

#include<stdio.h>
int main()
{
    char a;
    printf("Enter a letter :");
    scanf("%c",&a);
    switch(a)
    {
        case 'a':
        case 'e':
        case 'i':
        case 'o':
        case 'u': printf("Vowel");
        break;
        default : printf("Consonant");
    }
    return 0;
}

Enter a letter :u
Vowel

5. Write a program to input two numbers and then input the operator (+ , – , * , /) and find the result using switch.

#include<stdio.h>
int main()
{
    int a,b,d;
    char c;
    printf("Enter any two numbers : ");
    scanf("%d%d",&a, &b);
    printf("Enter operator (+, -, *, /):");
    scanf(" %c",&c); /* Space before %c */
    switch(c)
    {
        case '+':
        printf("Sum is : %d ",a+b);
        break;
        case '-':
        printf("Difference is : %d ",a-b);
        break;
        case '*':
        printf("Product is : %d ",a*b);
        break;
        case '/':
        printf("Division is : %d ",a/b);
        break;
        default : printf("Enter Again");
    }
    return 0;
}

Enter any two numbers : 15 5
Enter operator (+, -, *, /):/
Division is : 3

6. Write a program to create a menu driven program to add / subtract / multiply / divide two numbers using switch.

#include<stdio.h>
int main()
{
    int a,b,c,choice;
    printf("Enter the two numbers:");
    scanf("%d%d",&a,&b);
    printf("1. Add \n 2. Subtract \n 3. Multiply \n 4. Divide : \n");
    printf("Enter your choice:");
    scanf("%d",&choice);
    switch (choice)
    {
        case 1: c=a+b;
        printf("The result is : %d",c);
        break;
        case 2: c=a-b;
        printf("The result is : %d",c);
        break;
        case 3: c=a*b;
        printf("The result is : %d",c);
        break;
        case 4: c=a/b;
        printf("The result is : %d",c);
        break;
        default:printf("Enter again:");
    }
    return 0;
}

Enter the two numbers:2 4
1. Add 
 2. Subtract 
 3. Multiply 
 4. Divide : 
Enter your choice:3
The result is : 8

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