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POSegmentation fault after scanf on array passed to function
 

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  1. POSegmentation fault after scanf on array passed to function
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    <p>I'm trying to finish a workshop but I'm getting a segmentation fault after I call inputVector function in the if statement. I have no idea why it's giving me an error. There are no warnings at compile time and the testing on the array passed actually displays what was recorded. I'm running OSX Maverick but I also tested on a linux system to no avail. If someone could shine a light on this I'd really appreciate it. </p> <pre><code>#include &lt;stdio.h&gt; #include "matrix.h" int main() { int row = 0 , col = 0, option = 0; int vector[9], result[9]; int matrix[9][9]; do{ printf("Number of rows (0 to exit) ? "); scanf("%d", &amp;row); if(row != 0) { printf("Number of columns ? "); scanf("%d", &amp;col); inputMatrix(row, col, matrix); printf("Pre (0) or Post (1) Multiply ? "); scanf("%d", &amp;option); if(option == 0){ inputVector(row, vector); printf("TESTING 1"); preMulti(row, col, matrix, vector, result); printf("TESTING 2"); display(col, result); } else if(option == 1){ inputVector(col, vector); postMulti(row, col, matrix, vector, result); display(row, result); } return 0; }// END IF } while( row != 0 );// End While } // End Main </code></pre> <h3>matrix.cpp</h3> <pre><code>#include "matrix.h" #include &lt;stdio.h&gt; void inputMatrix(int row , int col, int matrix[][MAXCOL]) { for ( int i = 0; i &lt; row; i++) { printf("Row %d ? ", i + 1); for ( int k = 0; k &lt; col; k++) scanf("%d", &amp;matrix[i][k]); } } void inputVector(int size, int vector[]) { printf("Vector? "); for(int i = 0; i &lt; size; i++){ scanf("%d" , &amp;vector[i]); printf(" Recorded %d \n", vector[i]); } printf("TESTING 3"); } void preMulti(int row, int col, int matrix[][MAXCOL], int vector[], int result[]) { for(int i = 0; i &lt; col; i++ ) { result[i] = 0; for( int k = 0; k &lt; row; i++) result[i] += vector[k] * matrix[k][i]; } } void postMulti(int row, int col, int matrix[][MAXCOL], int vector[], int result[]) { for( int i = 0; i &lt; row; i++ ) { result[i] = 0; for( int k = 0; k &lt; col; i++) result[i] += vector[k] * matrix[i][k]; } } void display(int size, int vector[]) { printf("Result: "); for ( int i = 0; i &lt; size; i++) printf("%d ", vector[i]); } </code></pre>
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    1. USJonathan Leffler
    1. USPedro Paulo Bellesa
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    1. VO
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      1. POSegmentation fault after scanf on array passed to function
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      1. VTDownMod
    1. CODebuggers are a pretty good tool for dealing with segfaults.
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      1. POSegmentation fault after scanf on array passed to function
      1. USchris
    2. COWhat did gdb tell you? What did valgrind tell you?
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      1. POSegmentation fault after scanf on array passed to function
      1. USCharlie Burns
    3. COIt would be an improvement _not_ to name your int array _vector_, as `vector` has special significance in C++. It is almost as confusing as if you were nameing a `struct` _Struct_
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      1. POSegmentation fault after scanf on array passed to function
      1. USryyker
 

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