Q.Write a C program to accept the sex code of a person and display whether the person is a male or a female. The textbook presents this worked program, transcribed exactly as printed (including its printed errors):

#include <stdio.h>  
void main()  
{  
char, sex-code;  
printf("Enter the sex code(m/f)\n");  
scanf("%c", &sex_code);  
switch (sex_code)  
{  
    case'm': printf("MALE\n");  
        break;  
    case'f': printf("FEMALE\n");  
        break;  
    default: printf("Error in typing sexcode\n");  
        break;  
}  
/* End of switch */  
} /*End of main()*/  

Sample output printed in the textbook:

Enter the sex code (m/f)  
f  
FEMALE  

The switch statement is a multi-way decision statement. It compares the value of a single expression against several constant case labels and executes the block belonging to the matching case. It is a cleaner alternative to a long chain of if-else-if tests when the choice depends on one value.

Its general form is:

switch (expression)
{
    case value1: statements;
                 break;
    case value2: statements;
                 break;
    default:     statements;
}

Its key rules are: the expression and the case labels must be of an integer or character type (not real numbers or strings); each case label must be a constant; the break statement at the end of a case transfers control out of the switch - without it, execution falls through into the following cases; and the optional default block runs when no case matches. …