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Two-dimensional arrays in C

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• Syntax to define a one-dimensional arrays in C
  • Syntax to define an two dimensional array in C:

    DataType varName [ size1 ] [ size2 ] ;

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  • Example:

    double a[5][10]; // Define 5x10 array of double int b[4][20]; // Define 4x20 array of int

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  • Example C program:

    int main( int argc, char* argv[] ) { double a[3][6]; // Define 2 dim array int i, j; for ( i = 0; i < 3; i++ ) for ( j = 0; j < 6; j++ ) a[i][j] = i+j; // Access element in 2 dim array for ( i = 0; i < 3; i++ ) { for ( j = 0; j < 6; j++ ) printf( "%lf ", a[i][j] ); printf( "\n" ); } }

    Output:

    0.000000 1.000000 2.000000 3.000000 4.000000 5.000000 1.000000 2.000000 3.000000 4.000000 5.000000 6.000000 2.000000 3.000000 4.000000 5.000000 6.000000 7.000000

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  • Example Program: (Demo above code)                                                
    • Prog file: click here

    How to run the program:

    Right click on link and save in a scratch directory To compile:   gcc array3.c To run:          ./a.out