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Use ctrl-D if Ur working in Unix.

The best book is "The C programming Language" By Brain w. kernighan Dennis M.ritchie

Identity matrix is one in which whose rows and columns are equal the value is 1 otherwise 0. For Identity matrix code is for(i=0;i<row;i++) for(j=0;j<col;j++) { if (i==j) a[i][j]=1; else a[i][j]=0; }

Identity matrix is one in which where row=col there will be one in all the other places it will be zero. This code may help U. #include<stdio.h> int main(void) { int row,col,i,j,a[10][10]; //please enter rows and columns equal. printf(&quot;enter the number of rows&quot;)...

+=,-=,*=,/= are special type of assignment operators. E.g:- a+=b means a=a+b a-=b means a=a-b a*=b means a=a*b a/=b means a=a/b Thnak U for giving this opportunity.

Sparse matrix is one which consists of many zero's in it. To reduce the memory we will convert the matrix as sparse matrix. E.g:- 1 0 0 0 2 0 3 0 0 The sparse mtarix for the above is row cloumn value 1 1 1 2 2 2 3 1 3 For more details...

friend in earlier program in the last for loop some mistake is there due to typing mistake. the last for loop in the program is for(k=0;k<a;k++) putchar('*'); but it should be for(k=0;k<a[i];k++) putchar('*'); sorry for the type of inconvience.

Dear friend, Why don't use qsort which is a library routine of stdlib.h.

I hope the following Program may help U. #include<stdio.h> int main(void) { i,j,k,a[9]={1,3,5,7,9,7,5,3,1}; for(i=0;i<9;i++)//loop for stars { putchar('\n'); if(i<=4) { for(j=0;j<10-a[i]+i;j++)//loop for spaces for first 5 lines putchar(' '); } else...