2D Arrays

2D Arrays is suitable to hold tabular information for example it can be used to store 4 students degrees in 6 subjects or to represent (mxn) matrix.

Example 1 : (scan matrix) Calculate the summation and average for matrix (3x3).

C code : 

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#include <stdio.h> #include <stdlib.h> int main() { int i,j,sum=0,average ; int a [3][3] ; for (i=0;i<3;i++){ for(j=0;j<3;j++){ scanf("%d",&a[i][j]); } } for (i=0;i<3;i++){ for(j=0;j<3;j++){ sum+=a[i][j]; } } average=sum/6; printf("sum=%d\n",sum); printf("average=%d\n",average); return 0; }

Output :

Example 2 : (Print) Calculate The Transpose of 3x3 matrix.

Code 

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#include <stdio.h> #include <stdlib.h> int main() { int i,j ; int a [3][3]={ {2,3,4}, {7,8,9}, {5,2,0} } ; int t[3][3]; for (i=0;i<3;i++){ for(j=0;j<3;j++){ t[j][i]=a[i][j]; } } for (i=0;i<3;i++){ for(j=0;j<3;j++){ printf("%d\t",t[i][j]); } printf("\n"); } }

Output :

  

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