Switch case statement in c programming; In this tutorial, i am going to show you what is switch case statement and how to use switch case statement in c programming programs.
Switch Case Statement in C Programming
The c programming switch case statement is used to test multiple conditions and perform a different task for each conditions.
Syntax of goto Statement in c programming
Syntax of switch case statement in c; as shown below:
switch (variable or an integer expression)
{
case constant:
//C Statements
;
case constant:
//C Statements
;
default:
//C Statements
;
}
Example 1 – Simple C Program using Switch Case Statement
Let’s take an first example using switch case statement in c; as shown below:
#include <stdio.h>
int main()
{
int num=2;
switch(num+2)
{
case 1:
printf("Case1: Value is: %d", num);
case 2:
printf("Case1: Value is: %d", num);
case 3:
printf("Case1: Value is: %d", num);
default:
printf("Default: Value is: %d", num);
}
return 0;
}
Output
15
Example 2 – Simple Calculator c Program using Switch Case
Let’s create simple calculator c program using switch case; as shown below:
#include <stdio.h>
int main() {
char op;
double first, second;
printf("Enter an operator (+, -, *, /): ");
scanf("%c", &op);
printf("Enter two operands: ");
scanf("%lf %lf", &first, &second);
switch (op) {
case '+':
printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf", first, second, first / second);
break;
// operator doesn't match any case constant
default:
printf("Error! operator is not correct");
}
return 0;
}
Output
Enter an operator (+, -, *,): * Enter two operands: 1.5 4.5 1.5 * 4.5 = 6.8
Example 3 – Simple c Program using Switch Case without Break Statement
Let’s create simple c program using switch case without break statement; as shown below:
#include<stdio.h>
int main()
{
/* Local Variable Definition */
char grade;
printf("Enter your grade (Like A, B, C):\n");
scanf("%c", &grade);
switch(grade)
{
case 'A':
printf("Excellent\n");
case 'B':
printf("\n\n\nKeep it up!\n\nNo break statement\n\nHence all the case following this(but not the ones above this) except the default case will get executed !\n\n");
case 'C':
printf("\n\n\t\tCase C : Well done !\n\n");
case 'D':
printf("\t\tCase D : You passed!\n\n");
case 'F':
printf("\t\tCase E : Better luck next time\n\n\n");
default:
printf("\t\tDefault Case : Invalid grade\n\n\n");
}
printf("Your grade is %c\n",grade);
printf("\n\n\t\t\t Happy coding !\n\n\n");
return 0;
}
Output
/tmp/AuYmOiRg3h.o Enter your grade (Like A, B, C): A Excellent Keep it up! No break statement Hence all the case following this(but not the ones above this) except the default case will get executed ! Case C : Well done ! Case D : You passed! Case E : Better luck next time Default Case : Invalid grade Your grade is A Happy coding !