2 replies to this topic

[vuduz]

trying to learn C programming...stuck on addition exercise

CODE:


#include <stdio.h>

main()
{
int integer1, integer2, sum;

printf("Enter first integer\n");
scanf("%d",integer1);
printf("Enter second integer\n");
scanf("%d",integer2);
sum = integer1 + integer2;
printf("Sum is %d\n", sum);

return 0;
}

warning: return type defaults to 'int'|
||In function 'main':|
|10|warning: format '%d' expects type 'int *', but argument 2 has type 'int'|
|12|warning: format '%d' expects type 'int *', but argument 2 has type 'int'|
|10|warning: 'integer1' is used uninitialized in this function|
|12|warning: 'integer2' is used uninitialized in this function|
||=== Build finished: 0 errors, 5 warnings ===|

program crashes when i input 2nd integer

[Alexander]

Scanf's second argument takes a variable, and writes to it. To reference to a variable you wish to write to, you have to apply the & before the variable to get the memory address of it.

scanf("%d", &integer1);

This basically says "Scan an integer from input, in to the memory location of integer1."

You can read more about scanf's parameters here:
scanf - C++ Reference

And a brief knowledge of pointers can help you along the way to understand C's basic functions:
Codecall: Pointers - Crash course

[vuduz]

So simple now that you've explained it. Worked like a charm.
Thanks a lot. Will be working my way through those tutorials.