Trouble with input using scanf()

Question

I'm new to C so I'm having a bit of trouble with scanf().

#include <stdio.h>
#include <stdlib.h>

int main()
{
int height;
int weight;

printf("Enter height in inches:\n");
scanf("%d", &height);

printf("Enter weight in pounds:\n");
scanf("%d", &weight);

printf("You are %d inches tall and weigh %d pounds.", height, weight);

return 0;
}

I'm pretty sure this is the correct syntax but when I run it, it shows an empty screen and after I input 2 numbers it shows:

64

120

Enter height in inches:

Enter weight in pounds:

You are 64 inches tall and weigh 120 pounds.

According to some tutorials, it's supposed to display "Enter height in inches:" before I input the 1st number and "Enter weight in pounds:" before I input the 2nd number. Please help me!

I'm using Eclipse to write my programs and MinGW as the compiler if that's relevant.

Your symptoms don't correspond to your code

M.M
– M.M

2014-09-25 03:30:00 +00:00
Commented Sep 25, 2014 at 3:30 — M.M
– M.M, Commented Sep 25, 2014 at 3:30

Spikatrix · Accepted Answer · 2022-09-04 11:46:48Z

2

Its a bug in eclipse and this has been reported by many people using eclipse and MinGW.

To fix this you could do one of the following:

Add the following code at the start of the main function:
```
 setvbuf(stdout, NULL, _IONBF, 0);
 setvbuf(stderr, NULL, _IONBF, 0);
```
This will cause stdout and stderr to flush immediately whenever it is written to.
Use fflush(stdout) after every call to printf.

edited Sep 4, 2022 at 11:46

answered Sep 25, 2014 at 4:28

Spikatrix

20.3k7 gold badges44 silver badges85 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

dimitris93 · Accepted Answer · 2014-09-25 03:26:33Z

2

Try using scanf_s instead of scanf , i just ran it and it worked.

answered Sep 25, 2014 at 3:26

dimitris93

4,29512 gold badges54 silver badges93 bronze badges

Comments

thunpisit · Accepted Answer · 2014-09-25 03:27:34Z

0

I would suggest you to user sscanf insted of scanf and add fgets to the top would be more logic.

It would be:

int height;
char buffer[32]; /*Add this to collect you data*/

printf("Enter height in inches:\n");
fgets(buffer,sizeof(buffer),stdin); /*Add this line to get value from keyboard*/
sscanf(buffer,"%d", &height); /*Change scanf to sscanf*/

and same of the other one

answered Sep 25, 2014 at 3:27

thunpisit

1171 gold badge4 silver badges12 bronze badges

Comments

smushi · Accepted Answer · 2014-09-25 03:30:17Z

0

I suggest usying Putty if on Windows or command line on Mac OSX. Use "Wal Werror" compiler

Yes, you need to wait for it to display the output before enterning number.

E.g. you run the program When this line appears

Enter height in inches:

then enter

then when this appears

Enter weight in pounds:

Then enter

then output should be as expected

edited Sep 25, 2014 at 3:30

answered Sep 25, 2014 at 3:24

smushi

7196 silver badges17 bronze badges

Collectives™ on Stack Overflow

Trouble with input using scanf()

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related