#TRY_ON_YOUR IDE
C++ code that calculate addition of matrix transpose and multiplication


#include <iostream>

using namespace std;
void multi(int arr[3][4],int arr2[4][3]);
void add(int mat[3][4],int m[3][4]);
void transpose(int arr[3][4]);
int main()
{
int a;
int matrix[3][4],matri[4][3],m2[3][4];
cout<<"command; "<<"\t enter respective numbers\n\t1)transpose\t2)matrixes multipilication with another matrixes\t3) to add matrices with another\n\t4)exit ";cin>>a;
if(a!=4)
{
for(int i=0;i<3;i++)
{
cout<<"\tenter 3x4 matrices row "<<i+1<<endl;
for(int j=0;j<4;j++)
{
cin>>matrix[i][j];
}

}

}



switch(a)
{
case 1:
transpose(matrix);
do
{
main();}
while(a==4);
break;
case 2:
for(int i=0;i<4;i++)
{
cout<<"enter 4x3 matrix's row "<<i+1<<endl;
for(int j=0;j<3;j++)
{
cin>>matri[i][j];
}


}multi(matrix,matri);
do
{
main();}
while(a==4);
break;
case 3:
for(int i=0;i<3;i++)

{
cout<<"enter second 3x4 matrix's row "<<i+1<<endl;
for(int j=0;j<4;j++)
{
cin>>m2[i][j];
}
} add(matrix,m2);
do
{
main();}
while(a==4);
}

return 0;
}





void transpose(int arr[3][4])
{
cout<<endl<<"before transposing"<<endl;
for(int i=0;i<3;i++)
{
for(int j=0;j<4;j++)
{
cout<<"\t"<<arr[i][j];
}
cout<<endl;
}
cout<<"after transposing"<<endl;
for(int i=0;i<=3;i++)
{
for(int j=0;j<3;j++)
{
cout<<"\t"<<arr[j][i];
}

cout<<endl;

}
}



void multi(int arr[3][4],int arr2[4][3])
{
cout<<"\tthe multiplication of two matrices are;\n";
int temp[3][4];
for(int i=0;i<3;i++)
{
for (int j=0;j<3;j++)
{
temp[i][j]=0;
for(int k=0;k<4;k++)
{
temp[i][j]+=arr[i][k]*arr2[k][j];
}
}
}

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<"\t"<<temp[i][j];
}
cout<<endl;
}
}

void add(int mat[3][4],int m[3][4])
{
cout<<"\n\tthe addition of two matrices are: \n";
for(int i=0;i<3;i++)
{
for(int j=0;j<4;j++)
{
cout<<"\t"<<mat[i][j]+m[i][j]<<"\t";
} cout<<"\n";
}
}


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#Single_Dimensional_Array
The single-dimensional array may be defined as the type of array capable of holding the values of the same data centre in the form of a list
EXAMPLE; SEE BELOW


#include <iostream>
#include <conio.h>
using namespace std;
void main()
{
int val_array[3];
int int_val=1,counter;
cout<<"Please enter three numbers that you want to multiply"<<endl;
for(counter=0;counter<3;counter++)
{
cin>>val_array[counter];
int_val = int_val*val_array[counter];
}
cout<<"The multiplication of these three numbers is = "<<int_val;
getch();
}




#Multidimensional_Array

The multidimensional array may be defined as the array that holds the values in the way a matrix does. The two-dimensional array is used very often, and with the increase in the size of dimension, the array gets complicated.

EXAMPLE; SEE BELOW

#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int val_array[5][5];
int count_rows,count_cols,counter1,counter2;
cout<<"Please enter the size of the rows and columns that you wnant to input: ";
cin>>count_rows>>count_cols;
cout<<"PLease enter the values for matrics in row wise manner"<<endl;
for(counter1=0;counter1<count_rows;counter1++)
for(counter2=0;counter2<count_cols;counter2++)
cin>>val_array[counter1][counter2];
cout<<"The matrix will be as follows"<<endl;
for(counter1=0;counter1<count_rows;counter1++)
{
for(counter2=0;counter2<count_cols;counter2++)
cout<<val_array[counter1][counter2]<<" ";
cout<<endl;
}
getch();
return 0;
}

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worksheet for c++

prepared at AAU

continued....

In C++ an array variable is actually a
pointer variable that points to the first indexed variable of the array. Given the
following two variable declarations, p and a are the same kind of variable:
int a[10];
#def int* IntPtr;
IntPtr p;

* The fact that a and p are the same kind of variable. Since a is a pointer that points to a variable of type int (namely the
variable a[0]), the value of a can be assigned to the pointer variable p as
follows:
p = a;

After this assignment, p points to the same memory location that a points to. So, p[0], p[1], … p[9] refer to the indexed variables a[0], a[1], … a[9]. The square bracket notation you have been using for arrays applies to pointer variables as long as the pointer variable points to an array in memory

» You cannot change the pointer value in an array variable, such as a.




1 //Program to demonstrate that an array variable is a kind of pointer variable.
2 #include <iostream>
3 using namespace std;
4
5 #def int* IntPtr;
6
7 int main( )
8 {
9 IntPtr p;
10 int a[10];
11 int index;
12
13 for (index = 0; index < 10; index++)
14 a[index] = index;
15
16 p = a;
17
18 for (index = 0; index < 10; index++)
19 cout << p[index] << " ";
20 cout << endl;
21
22 for (index = 0; index < 10; index++)
23 p[index] = p[index] + 1;
24
25 for (index = 0; index < 10; index++)
26 cout << a[index] << " ";
27 cout << endl;
28
29 return 0;
30 }

#what_is_the_output_of_these_program?

https://t.me/+txk6Ik_UwGc4ZGM0

https://t.me/+txk6Ik_UwGc4ZGM0

//a program that works average of n students' maths score

#include <iostream>
using namespace std;

int main(){

int sum,n,i,sub_total;
sum =0;
n = 1;
sub_total = 0;
cout <<"enter number of students: ";
cin >>n;
int array[sub_total];
for(i=1;i>=n;i++)
{ if(array[i]>=0){
cout <<"score of e student "<<i <<": " << endl;
cin >> array[i];
sum+= array[i];



}

}

cout <<"the sum is: " << sum << endl;
float average;
average = sum/n;
cout <<"the average is: " << average;
}

//charging of parked car

#include <iostream>
using namespace std;

int main()
{
char type;
int charge, hours;
charge = hours* type;
cout <<"enter your vehicle 'c' 'b' 't': ";
cin >> type;

switch(char){
case 'c':

cout << "enter the parked hours: ";
cin >> hours;
charge = 2 * hours;
cout <<"your charged amount is $:\n" << charge;
break;
case 'b':

cout <<"enter hours parked: ";
cin << hours;
charge = 3 * hours;
cout <<" your charged amount is $:\n" << charge;
break:
case 't':

cout <<"enter the parked hours: ";
cin >> hours;
charge = 5 * hours;
cout <<"your charged amount is $:\n" << charge;
break;


}
}

#include <iostream>
using namespace std;

int main()
{
char chr;
cout <<" Wel come to 'LEARN TO CODE' telegram channel.\n";
chr = 'j';
cout <<"Enter 'j' to join our channel." << endl;
cin >> chr;


cout <<"https://t.me/PROGRAMINGLANGUAGES1";

return 0;
}





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reference books for c++
1👉🏿https://t.me/PROGRAMINGLANGUAGES1/34
2👉🏿https://t.me/PROGRAMINGLANGUAGES1/30
3👉🏿https://t.me/PROGRAMINGLANGUAGES1/85
4👉🏿https://t.me/PROGRAMINGLANGUAGES1/88

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//C++ program for converting degree Celsius into Fahrenheit and vice versa


#include<iostream>
using namespace std;

int main()
{
float fahr, cel;
char option;

cout << "Choose from following option:" << endl;
cout << "1. Celsius to Fahrenheit." << endl;
cout << "2. Fahrenheit to Celsius." << endl;
cin >> option;

//option for converting celsius into fahernheit
if (option == '1')
{
cout << "Enter the temperature in Celsius: ";
cin >> cel;

fahr = (1.8 * cel) + 32.0; //temperature conversion formula
cout << "\nTemperature in degree Fahrenheit: " << fahr << " F" << endl;
}
//option for converting Fahrenheit into Celsius
else if (option == '2')
{
cout << "Enter the temperature in Fahrenheit: ";
cin >> fahr;

cel = (fahr - 32) / 1.8; //temperature conversion formula
cout << "\nTemperature in degree Celsius: " << cel << " C" << endl;
}
else
cout << "Error Wrong Input." << endl;

return 0;


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ppt from chapter #3_#5 for c++👌💻💻 https://t.me/PROGRAMINGLANGUAGES1