Create a basic matrix in C input by user

Question

I m trying to ask the user to enter the number of columns and rows they want in a matrix  and then enter the values in the matrix    I m going to let them insert numbers one row at a time   How can I create such function     include lt stdio h gt  main     int mat 10  10  i j   for i 0 i lt 2 i      for j 0 j lt 2 j       scanf   d   amp mat i  j         for i 0 i lt 2 i      for j 0 j lt 2 j      printf   d  mat i  j         This works for entering the numbers  but it displays them all in one line    The issue here is that I don t know how many columns or rows the user wants  so I cant print out  d  d  d in a matrix form     Any thoughts   Thanks

User · Accepted Answer

How about the following   First ask the user for the number of rows and columns  store that in say  nrows and ncols  i e  scanf   d    amp nrows    and then allocate memory for a 2D array of size nrows x ncols  Thus you can have a matrix of a size specified by the user  and not fixed at some dimension you ve hardcoded   Then store the elements with for i   0 i  lt  nrows    i      and display the elements in the same way except you throw in newlines after every row  i e   for i   0  i  lt  nrows    i       for j   0  j  lt  ncols     j              printf   d t  mat i  j         printf   n

User · Answer

You need to dynamically allocate your matrix  For instance   int  mat  int dimx dimy  scanf   d    amp dimx   scanf   d    amp dimy   mat   malloc dimx   dimy   sizeof int      This creates a linear array which can hold the matrix  At this point you can decide whether you want to access it column or row first  I would suggest making a quick macro which calculates the correct offset in the matrix

User · Answer

need a   for i 0 i lt 2 i        for j 0 j lt 2 j             printf   d  mat i  j          printf   n

User · Answer

include lt stdio h gt  int main void      int mat 10  10  i j   printf  Enter your matrix n      for i 0 i lt 2 i      for j 0 j lt 2 j              scanf   d   amp mat i  j            printf   nHere is your matrix  n       for i 0 i lt 2 i                for j 0 j lt 2 j                    printf   d   mat i  j                  printf   n

User · Answer

R stands for ROW and C stands for COLUMN     i stands for ROW and j stands for COLUMN    include lt stdio h gt   int main         int M 100  100        int R C i j       printf  Please enter how many rows you want  n         scanf   d   amp  R        printf  Please enter how column you want  n         scanf   d   amp  C        printf  Please enter your matrix  n         for i   0  i  lt  R  i              for j   0  j  lt  C  j                  scanf   d    amp M i  j                        printf   n               for i   0  i  lt  R  i              for j   0  j  lt  C  j                  printf   d t   M i  j                       printf   n              getch        return 0

User · Answer

int rows  cols   i  j  printf  Enter number of rows and cols for the matrix   n    scanf   d  d   amp rows   amp cols    int mat rows  cols    printf  enter the matrix      for i   0  i  lt  rows   i        for j   0  j  lt  cols  j            scanf   d    amp mat i  j     printf   nThe Matrix is  n    for i   0  i  lt  rows   i          for j   0  j  lt  cols  j                  printf   d  mat i  j            printf   t              printf   n

User · Answer

This is my answer   include lt stdio h gt  int main    int mat 100  100   int row column i j  printf  enter how many row and colmn you want  n  n    scanf   d   amp row   scanf   d   amp column   printf  enter the matrix      for i 0 i lt row i         for j 0 j lt column j             scanf   d   amp mat i  j           printf   n       for i 0 i lt row i         for j 0 j lt column j             printf   d  t  mat i  j      printf   n         I just choose an approximate value for the row and column  My selected row or column will not cross the value and then I scan the matrix element then make it in matrix size

[c] Create a basic matrix in C (input by user !)

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