Command-line Calculator Error:

This is a discussion on Command-line Calculator Error: within the C Programming forums, part of the General Programming Boards category; I'm having an error, when it reaches the answer, it always gives me 0!!! I attatched the image of the ...

  1. #1
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    Oct 2011
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    Command-line Calculator Error:

    I'm having an error, when it reaches the answer, it always gives me 0!!! I attatched the image of the error, as well as the C file where it resides.

    Code:
    #include <stdio.h>
    
    
    int main ()
    {
    	int r = 0;
    	int l = 0;
    	int b = 0;
    	int i = 0;
    	int n = 0;
    	int a = 0;
    	printf(" MARIOTUTORIALS CALCULATOR\n");
    	printf("\n");
    	printf("\n");
    	printf("\n"); 
    	printf("[1]  Add\n");
    	printf("[2]  Subtract\n");
    	printf("[3]  Multiply\n");
    	printf("[4]  Divide\n");
    	printf("\n");
    	printf("\n");
    	printf("Choose a number: $~ ");
    	scanf("%d", &n); 
    	getchar();	
    	if(n == 1)
    	{
    		printf("\n\nHow many numbers do you wish to add? ");
    		scanf("%d", &a);
    	}
    	for(i=0; i < a; i++)
    		{
    			printf("Your Number(s):  ");
    			scanf("%d", &l);
    			int b = l + b;
    		}
    		printf("\n\nANSWER: %d", b);
    		getchar();
    return(0);
    }
    Attached Images Attached Images  
    Attached Files Attached Files
    • File Type: c main.c (644 Bytes, 36 views)

  2. #2
    and the hat of wrongness Salem's Avatar
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    2b or not 2b, that is the question.

    Code:
    $ gcc -Wshadow -Wall bar.c
    bar.c: In function ‘main’:
    bar.c:33: warning: declaration of ‘b’ shadows a previous local
    bar.c:7: warning: shadowed declaration is here
    bar.c:5: warning: unused variable ‘r’
    You have one b too many.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    Code:
    	for(i=0; i < a; i++)
    		{
    			printf("Your Number(s):  ");
    			scanf("%d", &l);
    			int b = l + b;
    		}
    Remove the int keyword from your b = l + b; line (5)

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