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Printing out a matrix of characters

This is a discussion on Printing out a matrix of characters within the C Programming forums, part of the General Programming Boards category; Hello, So this question, I absolutely cannot get. Have been stuck here for hours This is way too frustrating. I'm ...

  1. #1
    Y2R
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    Unhappy Printing out a matrix of characters

    Hello,

    So this question, I absolutely cannot get. Have been stuck here for hours
    This is way too frustrating. I'm posting the question and my solution (REAL NOOB).
    I have an exam in a few days and this question is probably nothing compared to what might be on it. Thanks a lot in advance!

    The question is:

    Get the number of rows and columns from the user for the matrix. Then ask the user to enter the characters for the matrix. Finally, display the value on the top, right corner of the matrix.

    For example,

    The letter "q" must be displayed for the 4X2 Matrix of:

    a e c q
    d c o n


    My attempt:

    Code:
    #include<stdio.h>
    main()
    {
        char **matrix;
        int i,j;
        int row,col;
        
        printf ("Rows:");
        scanf ("%d",&row);
        printf ("\nColumns: ");
        scanf ("%d",&col);
        
        matrix=(char**)calloc(row,sizeof(char*));
        for(i=0;i<col;i++)
        matrix[i]=(char*)calloc(col,sizeof(char));
        
        for(i=0;i<row;i++)
        
        {
            for(j=0;j<col;j++)
            {
                scanf("%s",matrix[i]);
                if(matrix[i][j]==matrix[0][col-1])
                    printf("Top right corner is: %c",matrix[i][j]);
            }
        }
    }

  2. #2
    Y2R
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    This is the same program I got working, but using integers.

    Code:
    #include<stdio.h>
    main()
    {
    	int **matrix;
    	int i,j;
    	int row,col;
    	
    	printf ("Rows: ");
    	scanf ("%d",&row);
    	printf ("\nColumns: ");
    	scanf ("%d",&col);
    	
    	matrix=(int**)calloc(row,sizeof(int*));
    	for(i=0;i<col;i++)
    	matrix[i]=(int*)calloc(col,sizeof(int));
    	
    	for(i=0;i<row;i++)
    	
    	{
    		for(j=0;j<col;j++)
    		{
    			scanf("%d",&matrix[i][j]);
    			if(matrix[i][j]==matrix[0][col-1])
    				printf("Top right corner is: %d\n",matrix[i][j]);
    		}
    	}
    }

  3. #3
    Registered User camel-man's Avatar
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    So you only have to display the top right corner everytime?

  4. #4
    and the hat of wrongness Salem's Avatar
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    > scanf("%s",matrix[i]);
    The problem here is you're reading a string, not a char.

    Perhaps
    scanf(" %c",&matrix[i][j]);
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
    Y2R
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    Quote Originally Posted by Salem View Post
    > scanf("%s",matrix[i]);
    The problem here is you're reading a string, not a char.

    Perhaps
    scanf(" %c",&matrix[i][j]);
    Yup, tried that. Doesn't work either.

    Code:
    #include<stdio.h>
    main()
    {
    	char **matrix;
    	int i,j;
    	int row,col;
    	
    	printf ("Rows: ");
    	scanf ("%d",&row);
    	printf ("\nColumns: ");
    	scanf ("%d",&col);
    	
    	matrix=(char**)calloc(row,sizeof(char*));
    	for(i=0;i<col;i++)
    	matrix[i]=(char*)calloc(col,sizeof(char));
    	
    	for(i=0;i<row;i++)
    	
    	{
    		for(j=0;j<col;j++)
    		{
    			scanf("%c",&matrix[i][j]);
    			if(matrix[i][j]==matrix[0][col-1])
    				printf("Top right corner is: %c\n",matrix[i][j]);
    		}
    	}
    Doesn't really work properly as the integer one I made

  6. #6
    Y2R
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    Quote Originally Posted by camel-man View Post
    So you only have to display the top right corner everytime?
    Yup, exactly.

  7. #7
    and the hat of wrongness Salem's Avatar
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    Read my post again, you managed to delete a critical space in the scanf call.
    Y2R likes this.
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  8. #8
    Y2R
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    Quote Originally Posted by Salem View Post
    Read my post again, you managed to delete a critical space in the scanf call.
    Whoah! THANK YOU SO MUCH! You saved so much of my time. Couldn't believe it worked. And sorry about not noticing that space. Never knew about the spacing and stuff. Once again, I really appreciate your help

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