Problem 13: Equation

Take four integer variables a, b, x and y. Scan the values of the variables from user using scanf() function. Now print the output of the following equation:

(a*b) + (x*y) 

Code: 
 

    #include<stdio.h> 


int main()
{

    int a,b,x,y;

    printf("Enter the value of a, b, x and y:\n");
    scanf("%d%d%d%d",&a,&b,&x,&y);

    printf("%d\n",(a*b)+(x*y));

    return 0;
}
Problem 14: Fahrenheit

Take temperature of Dhaka city as input in Celsius scale from the user using scanf() function and convert it to Fahrenheit and print it.

[Formula: F = C(9/5) +32] 

Code: 
 

    #include<stdio.h> 


int main()
{
    double celsius,farenheit;

    printf("Enter the temperature in Celsius:");
    scanf("%lf",&celsius);

    farenheit=((celsius*(9.0/5.0))+32);
    printf("%lf\n",farenheit);

    return 0;
}
Problem 15: Capital

Take a small letter alphabet as input from the user and print the capital version of that letter. [If user gives input ‘a’ you should print ‘A’]

Code: 
 

    #include<stdio.h> 


int main()
{

    char letter;

    printf("Enter a small letter: \n");
    scanf("%c",&letter);
    printf("Capital version is: %c\n",letter-32);

    return 0;
}