IT. Expert System.

C

case


case says that if it has the value of whatever is after that case then do whatever follows the colon.

Syntax:
switch (n) {
case constant1:
   	code/s to be executed if n equals to constant1;
   	break;
case constant2:
   	code/s to be executed if n equals to constant2;
   	break;
   .
   .
   . 
default:
   	code/s to be executed if n doesn't match to any cases;
}


Example:

# include 
int main() {
    char o;
    float num1,num2;
    printf("Select an operator either + or - or * or / \n");
    scanf("%c",&o);
    printf("Enter two operands: ");
    scanf("%f%f",&num1,&num2);
    switch(o) {
        case '+':
            printf("%.1f + %.1f = %.1f",num1, num2, num1+num2);
            break;
        case '-':
            printf("%.1f - %.1f = %.1f",num1, num2, num1-num2);
            break;
        case '*':
            printf("%.1f * %.1f = %.1f",num1, num2, num1*num2);
            break;
        case '/':
            printf("%.1f / %.1f = %.1f",num1, num2, num1/num2);
            break;
        default:
            /* If operator is other than +, -, * or /, error message is shown */
            printf("Error! operator is not correct");
            break;
    }
    return 0;
}


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