Error when running C-program after first input [closed] - c

Question

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
Closed 6 years ago.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Improve this question
The program shuts down after I enter the first input
#include<stdio.h>
int main(void)
{
int biology,chemistry;
printf("\nEnter marks for maths");
scanf("%d",biology);
printf("\nEnter marks for tech1");
scanf("%d",chemistry);
return(0);
}

Answer 1

C function parameters are always "pass-by-value", which means that the function scanf only sees a copy of the current value of whatever you specify as the argument expression.
If you passed biology, then it would only see an uninitialized value. On the other hand &biology is a pointer value that refers to the variable i.e scanf can use this to modify biology.
The scanfwould need to be modified as follows
scanf("%d", &biology);
scanf("%d", &chemistry);
To understand this in detail read Why does scanf require &

Answer 2

You are passing incorrect arguments to scanf() calls. You must pass the address of the variables (see scanf()'s documentation) to match %d format.
scanf("%d", &biology);
...
scanf("%d", &chemistry);
You should also check the return code to see if the scanf() calls succeeded.