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Section 10.1 The switch() Statement

The switch() statement is a selection control structure that allows one of several alternatives to be executed, depending on the value a variable takes. To be more precise, a switch() statement allows a variable to be compared to a list of values. Each value is called a case. If the variable equals a value from the list then the instructions following that particular case are executed.
Let’s take a look at an example:

Compile and run the code below in your own C environment.

#include <stdio.h>

int main(void) {
    int a = 10;
    int b = 3;
    int c;
    int okay = 1;
    
    char op = '+';
    
    switch(op) {
        case '+': 
            c = a+b;
            break;
        case '-':
            c = a-b;
            break;
        case '*':
            c = a*b;
            break;
        case '%':
            c = a%b;
            break;
        case '/':
            c = a/b;
            break;
        default:
            printf("Unknown operator.\n");
            okay = 0;
            c = 0;
    }
    
    if (okay) printf("\n%d %c %d = %d\n", a, op, b, c);
    return(0);
}

Subsection 10.1.1 switch() Statement Practice

Activity 10.1.

Please complete the program below so that it prints out the correct month, depending on the value of the variable “month”. For example, if month=3, the program should print 
We are in the month of March.
Your program should use a switch() statement.

Compile and run the code below in your own C environment.

#include <stdio.h>
int main(void)
{
    int month = 3;
    
    printf("\nWe are in the month of ");
    
    /* Please complete this code. */
    
    return(0);
}
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