CODEWITHSUNDEEP
c
Levetica
Levetica

Reputation: 13

Loop is skipping while statement

I'm just trying to get this program to take a number between 1 and 9 and calculate the radius and display it. This program is supposed to loop but all I'm getting is the "Thank you for using the software!" print function, it's not going through the loop at all and I can't seem to understand why.

#include <stdio.h>
int main(void){

float i,r, V;
for(i=0; i <= 4; i++){
    while ( r != 0) {
        printf("Enter a radius between 1 and 9: \n");
        scanf ("%f", &r);
        V= (3.141592)*r*r*10;
        if (r>=1 && r<=9){
            printf("The cylinder volume is %f\n", V);
        }
        else if (r > 9 || r < 0){
            printf ("The input is out of the acceptable range. Select an integer less than $/n");
        }
        printf("Thank you for using the software!\n");
    }
    return 0; 
}

Upvotes: 1

Views: 106

Answers (4)

Aqeel Abbas
Aqeel Abbas

Reputation: 169

you better use a do while loop to do that they way you are trying to do.

for(i=0; i <= 4; i++){
    do {
        printf("Enter a radius between 1 and 9: \n");
        scanf ("%f", &r);
        V= (3.141592)*r*r*10;
        if (r>=1 && r<=9){
            printf("The cylinder volume is %f\n", V);
        }
        else if (r > 9 || r < 0){
            printf ("The input is out of the acceptable range. Select an integer less than $/n");
        }while ( r != 0)
        printf("Thank you for using the software!\n");
    }

i haven't tried this by my self.this might work.try it if it works.

Upvotes: 0

user3121023
user3121023

Reputation: 8308

To make sure the loop is executed at least once, you could use

do { // your code } while ( r != 0);

Upvotes: 1

Aqeel Abbas
Aqeel Abbas

Reputation: 169

you have not initialize r before using it. you must initialize it or use i to iterate though the loop.

INITIALIZE r here before using
    for (i = 0; i <= 4; i++)
     {
        while (r != 0)
        {
          //code
        }
     }

Upvotes: 1

C.B.
C.B.

Reputation: 8346

You never initialize r before entering your while loop, so this is undefined behavior.

Additionally, you want to use int s for equality operators, i.e. == or !=. In your case, you might want to include an "error" that r can be within.

Upvotes: 6

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