2D Arrays in C++ Programming
Master the concepts of two-dimensional arrays in C++ with practical examples like reading arrays, finding the largest number, exchanging columns, switching rows, and converting 2D arrays to 1D. Enhance your understanding of array manipulation and traversal techniques.
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ARRAYS : TWO DIMENSION (2-D) IN C++ LANGAUGE Setting By : A. L. Waleed Rasheed Twelfth Lecture
Arrays : two dimension (2-D) int Arr[3][4]; int arr[3][4] = { {26, 34, 22, 17}, {24, 32, 19, 13}, {28, 38, 25, 20} }; 26 24 28 34 32 38 22 19 25 17 13 20 for ( i = 0; i < n; ++i) for ( j = 0; j < m; ++j) Cin>>arr[i][j]; for ( i = 0; i < n; ++i) { for ( j = 0; j < m; ++j) cout<<arr[i][j]<<"\t"; cout<<"\n"; }
EX//W.P. to read integer array[3,3] and find largest No.? #include<iostream.h> main() { const int n = 3; int arr[n][n]; //read array 2_D for ( i = 0; i < n; ++i) for ( j = 0; j < n; ++j) cin>>arr[i][j]; //Find largest No. in array larg=arr[0][0]; for ( i = 0; i < n; ++i) for ( j = 0; j < n; ++j) if (arr[i][j]>larg) cout<<"Largest No.= "<<larg; } int i,j,larg; larg=arr[i][j];
EX// W. P. to exchange 2nd column with 5th column of array s[5,7]? #include <iostream.h> main() { int s[5][7],i,j,t; for(i=0;i<5;i++) // Read array 2_D, s[5,7] for(j=0;j<7;j++) cin>>s[i][j]; 2 5 for(i=0;i<5;i++) // exchange operation { t=s[i][1]; s[i][1]=s[i][4]; s[i][4]=t; } for(i=0;i<5;i++) // print array s[5,7] after exchange { for(j=0;j<7;j++) cout<<" "<<s[i][j]; cout<<"\n"; } }
Q / write program section to switch the second column place the third row in the matrix A[5,5]? for (i=0;i<5;i++) for (j=0;j<5;j++) if (i==j) { t=a[i][1]; a[i][1]=a[2][j]; a[2][j]=t; } j 0 1 2 3 4 i 0 1 2 3 4
Q/W.P. to convert array 2-D a[3][3] to 1-D? #include<iostream.h> void main() { const int n=3; int a[n][n]={{1,2,3},{4,5,6},{7,8,9}}; int b[9]; int i,j,k=0; for(i=0;i<n;i++) for(j=0;j<n;j++) { b[k]=a[i][j]; k++;} for(i=0;i<9;i++) cout<<" "<<b[i]; }
Homework Q1 / write program section to switch the second row place fourth row in the matrix A[5,5]? Q2/W.P. to convert array 1-D a[9] into array 2-D? Q3/W.P. to find largest No. to each row in array a[3][3]? Q4/W.P. to calculate summation to each row in array a[3][3]?
