Index of programs:Set 4

Becoming more complex after 2 programs below

Multiplication of two matrices

Symmetric matrix

To write to a file using structures

To read students database

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Program1:
#include<iostream.h> #include<conio.h> /* Author : Rohith.R Email : rrohithr@gmail.com Category : Begineer Program : Matrix Multiplication Meant For : Plus Two students,Kerala */ void main() { int a[50][50],b[50][50],c[50][50]; int m,n,p,q,i,j; cout<<"\n Enter order of Ist matrix"; cin>>m>>n; cout<<"\n Enter order of 2nd matrix"; cin>>p>>q; if(n==p) { cout<<"\n Enter elements of Matrix 1"; for(i=1;i<=m;i++) for(j=1;j<=n;j++) cin>>a[i][j]; cout<<"\n Enter elements of matrix 2"; for(i=1;i<=m;i++) for(j=1;j<=n;j++) cin>>b[i][j]; for(i=1;i<=m;i++) for(j=1;j<=q;j++) { c[i][j]=0; for(int k=1;k<=n;k++) c[i][j]=c[i][j]+a[i][k]*b[k][j]; } cout<<"\n Product of matrix\n"; for(i=1;i<=m;i++) { cout<<"\n"; for(j=1;j<=q;j++) cout<<"\t"<<c[i][j]<<"\t"; } } cout<<"\n Multiplication not possible"; cout<<"\n\n Press any key to continue"; getch(); }

Program 2:

#include<iostream.h> #include<conio.h> /* Author : Rohith.R Email : rrohithr@gmail.com Category : Begineer Program : To find whether matrix is symmetric Meant For : Plus Two students,Kerala */ void main() { int a[50][50],b[50][50],m,n,i,j; clrscr(); start:cout<<"Enter rows of Matrix 1"; cin>>m; cout<<"Enter cols of Matrix 2"; cin>>n; clrscr(); if(m!=n) { cout<<"Error rows must be equal to cols\n"; goto start; } cout<<"Enter Matrix 1\n"; for(i=1;i<=m;i++) for(j=1;j<=n;j++) cin>>a[i][j]; for(i=1;i<=m;i++) for(j=1;j<=n;j++) b[j][i]=a[i][j]; // Matrix A cout<<"\tMatrix 1 elements \n\n "; for(i=1;i<=m;i++) { for(j=1;j<=n;j++) { cout<<"\t"<<a[i][j]<<"\t"; } cout<<"\n"; } cout<<"\n\n\n\n\t Matrix Transpose\n"; for(i=1;i<=n;i++) { for(j=1;j<=m;j++) { cout<<"\t"<<b[i][j]<<"\t"; } cout<<"\n"; } int flag=1; for(i=1;i<=m;i++) for(j=1;j<=n;j++) if(b[j][i]!=b[i][j]) { flag=0; break; } if(flag!=0) cout<<"\nSymmetric"; else cout<<"\nNot symmetric"; getch(); }

Program 3:

#include<fstream.h> /* Author : Rohith.R Email : rrohithr@gmail.com Category : Begineer Program : To write to a file using structures Meant For : Plus Two students,Kerala */ ofstream writeto("student.txt",ios::app); struct student { char name[15]; int mark1,mark2; }stud; void main() { char option; do { cout<<"\n Enter student name:"; cin>>stud.name; cout<<"\n Enter mark1"; cin>>stud.mark1; cout<<"\n Enter mark2"; cin>>stud.mark2; writeto.write((char *)&stud,sizeof(stud)); cout<<"\n Do you want to continue(Y | N )"; cin>>option; }while(option=='Y'); }

Program 4:

#include<fstream.h> #include<string.h> #include<process.h> #include<conio.h> /* Author : Rohith.R Email : rrohithr@gmail.com Category : Begineer Program : To read student database (using files) Meant For : Plus Two students,Kerala */ class student { char name[15]; int mark1,mark2; public: void reads(); }stud; void student::reads() { ifstream readfrom("student.txt",ios::beg); cout<<"\n Enter student name to search for"; char sname[15]; int v; cin>>sname; if(!readfrom) { cout<<"\n Cannot open file"; getch(); exit(0); } else { while(readfrom) { readfrom.read((char *)&stud,sizeof(stud)); v=strcmp(stud.name,sname); if(v==0) { cout<<"\n Student name :"<<stud.name; cout<<"\n Student mark1:"<<stud.mark1; cout<<"\n Student mark2:"<<stud.mark2; break; } } } } void main() { clrscr(); stud.reads(); cout<<"\n Press any key to continue"; getch(); }

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