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Write a ‘C’ program to calculate sum of non_diagonal elements of an n*n matrix. #include<stdio.h> #include<conio.h> void main() { int a[3][3],i,j,sum=0; clrscr(); printf("\nENTER THE 3 X 3 MATRIX\n"); for(i=0;i<=2;i++) { for(j=0;j<=2;j++) { scanf("%d",&a[i][j]); } } for(i=0;i<=2;i++) { for(j=0;j<=2;j++) { if(i!=j) { sum=sum+a[i][j]; } } } printf("\n SUM OF NON-DIAGONAL ELEMENTS OF MATRIX IS :%d",sum); getch(); }

Write a ‘C’ program to count the number of characters, number of words and number of lines of a text file and display the result. #include<stdio.h> #include<conio.h> void main() { FILE *fp; char ch; int noc=0,now=0,nol=0; clrscr(); fp=fopen("a.txt","r"); if(fp==NULL) { printf("file does not exist"); exit(0); } while(1) { ch=fgetc(fp); if(ch==EOF)  break; noc++; if(ch==' ') now++; if(ch=='\n') nol++; } printf("%d\n%d\n%d",noc,now,nol); fclose(fp); getch(); }