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64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/* Matrix Sum - Program to find sum of diagonal elements, elements above diagonal and elements below diagonal of a given square matrix */
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#include <stdio.h>
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#include <conio.h>
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void main()
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{
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int x[10][10], nr, nc, r, c, sumd=0, suma=0, sumb=0 ;
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clrscr() ;
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printf("Enter the number of rows and columns: ") ;
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scanf("%d %d", &nr, &nc) ;
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printf("Enter elements of the matrix row-wise: \n") ;
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for(r=0 ; r<nr ; r++)
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for(c=0 ; c<nc ; c++)
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scanf("%d", &x[r][c]) ;
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for(r=0 ; r<nr ; r++)
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for(c=0 ; c<nc ; c++)
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{
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if(r==c)
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sumd = sumd + x[r][c] ;
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if(r<c)
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suma = suma + x[r][c] ;
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if(r>c)
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sumb = sumb + x[r][c] ;
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}
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printf("The sum of all diagonal elements is %d \n", sumd) ;
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printf("The sum of elements above diagonal is %d \n", suma) ;
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printf("The sum of elements below diagonal is %d \n", sumb) ;
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getch() ;
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}
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/* The following logic is also correct
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for(r=0 ; r<nr ; r++)
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for(c=0 ; c<nc ; c++)
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{
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if(r==c)
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sumd = sumd + x[r][c] ;
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if(r<c)
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{
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suma = suma + x[r][c] ;
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sumb = sumb + x[c][r] ; <---- SEE HERE CAREFULLY
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}
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}
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*/
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/*
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Output:
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Enter the number of rows and columns: 3 3
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Enter elements of the matrix row-wise:
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1 2 3
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4 5 6
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7 8 9
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The sum of all diagonal elements is 15
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The sum of elements above diagonal is 11
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The sum of elements below diagonal is 19
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*/
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