Create a text file and enter “to write a good program is very time consuming job.” Create another text which contains reverse of above text.

#include<stdio.h>

#include<conio.h>

void main()

{

  FILE *fp,*f;

  char str[]= "To write a good program is very time consuming";

  int i;

  fp=fopen("old.txt","w");

  fputs(str,fp);

  f=fopen("new.txt","w");

  for(i=strlen(str);0<i;i--)

    fputc(str[i],f);

  fclose(fp);

  fclose(f);

}

By: admin On 4:15 PM

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Given a text file, create another text file deleting the following words “three”, “bad”, and “time”.

#include<stdio.h>

#include<conio.h>

void main()

{

   FILE *fp;

   char str;

   fp=fopen("old.txt","r+");

   clrscr();

   while(fscanf(fp,"%s",str)!=EOF)

   {

      if(strcmp(str,"three")==0||strcmp(str,"bad")==0||strcmp(str,"time")==0)

      {

         printf("");

      }

    else

        printf("%s ",str);

 }

fclose(fp);

getch();

}

Note: Create a text file old.txt in same folder and write some words including three, bad and time.

By: admin On 4:13 PM

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Program to enter two 3x3 matrices and calculate the product of given matrices.

#include<stdio.h>
#include<conio.h>

void main()
{
  int a[3][3],b[3][3],c[3][3];
  int i,j,k;

  clrscr();
  printf("Enter the matrix A\n");

     for(i=0;i<3;i++)
      {
          for(j=0;j<3;j++)
           {
            scanf("%d",&a[i][j]);
           }
     }
  printf("Enter the matrix B\n");

    for(i=0;i<3;i++)
      {
        for(j=0;j<3;j++)
        {
           scanf("%d",&b[i][j]);
        }
      }

    for(i=0;i<3;i++)
      {
        for(j=0;j<3;j++)
         {
           c[i][j] = 0;
           for(k=0;k<3;k++)
           {
             c[i][j] += a[i][k] * b[k][j];
           }
         }
      }
  printf("\n\nThe product of two matrix\n\n" );
    for(i=0;i<3;i++)
    {
       for(j=0;j<3;j++)
       {
         printf("%d\t",c[i][j]);
       }

       printf("\n");
    }
getch();

}

By: admin On 4:05 PM

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Program which will read a line and delete from it all occurrences of the word “that”

#include<stdio.h>
#include<conio.h>
void main()
{
char str[]=”I that love c that programming.”;
int i;
clrscr();
for(i=0;str[i]!=’\0′;i++)
{
if(str[i]==116&&str[i+1]==104&&str[i+2]==97&&str[i+3]==116&&str[i+4]==32)
{
for(;str[i+5]!=’\0′;i++)
str[i]=str[i+5];
str[i]=’\0′;
i=0;
}
}
printf(“%s”,str);
getch();
}

By: admin On 10:33 AM

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