Add sub and multiplication in c with function 1

#include<stdio.h>

void add()
{
    int a=6,b=3;
    printf("summation=%d \n",a+b);

}

void sub()
{
    int a=10,b=3;
    printf("subtraction=%d \n",a-b);

}

void multi()
{
    int a=10,b=3;
    printf("multiplication=%d \n",a*b);

}

main()
{


    printf("We R in main function \n");
    add();
    sub();
    multi();





}

Function example 1 in c

#include<stdio.h>
void shukrabad()
{
    printf("We R in Shukrabad\n ");
}
main()
{
    shukrabad();
    printf("We R in main function \n");
    shukrabad();
}

String reverse in briefly

#include<stdio.h>
main()
{
    int i;
    char st[15];
    gets(st);///st="we are"
//    puts(st);///st="we"

//    for(i=0;i<st[i]!=NULL;i++)
//   {
//       //printf("%c",st[i]);
//       count++;
//   }
//   printf("Length=%d",count);
   //int length=strlen(st);
   //printf("Length=%d",length);
   for(i=strlen(st)-1;i>=0;i--)
   {
       printf("%c",st[i]);

   }
}

String reverse using strrev()

#include<stdio.h>

main()

{

    char st[15];

    gets(st);///st="we"

    puts(st);///st="we"

    strrev(st);///st="ew"

    puts(st);///st="ew"

}

Sum of 2 matrix

#include<stdio.h>
main()
{
    int row,col;
   int A[2][2]={3,4,2,6};
   printf("Matrix A :\n");

Input a matrix and output(2D Array practice)

#include<stdio.h>
main()
{
    int row,col,i,j;
     printf("Row number = ");
     scanf("%d",&row);///row = 3
     printf("Col number = ");
     scanf("%d",&col);///col = 2
     int A[row][col];

Declaration and print of 2 D Array

#include<stdio.h>
main()
{
    int row,col;
   int A[2][2]={3,4,2,6};
   printf("Matrix A :\n");
   for(row=0;row<2;row++)
   {
       for(col=0;col<2;col++)
       {
           printf("\tA[%d][%d]=%d ",row,col,A[row][col]);
       }
       printf("\n\n");
   }
   ///B mat
    int B[2][3]={3,2,6,4,7,8};
   printf("Matrix B :\n");
   for(row=0;row<2;row++)
   {
       for(col=0;col<3;col++)
       {
           printf("\t%d ",A[row][col]);
       }
       printf("\n");
   }
}