Read & Write MODE R+ MODE usage in FILES using C language

#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
FILE *f;
char c;
clrscr();
f=fopen("balaram.txt","r+");
if(f==NULL)
{
 printf("File can not appending");
 exit(1);
}
printf("\n contents read");
while(!feof(f))
{
printf("%c",getc(f));
}
printf("write data and to stop press'.':");
while(c!='.')
{
c=getche();
 fputc(c,f);
}
}

FINDING OF TRACE OF A MATRIX

#include<stdio.h>

main()

{

int a[10][10],i,j,sum=0;

printf("enter the values of m,n");

scanf("%d%d",&m,&n);

printf("enter the elements of matrix a");

for(i=0;i<m;i++)

for(j=0;j<n;j++)

scanf("%d",&a[i][j]);

for(i=0;i<m;i++)

for(j=0;j<n;j++)

if(i==j)

sum=sum+a[i][j];

printf("trace of a matrix=%d",sum);

}

Appending & Reading with A+ MODE using C language

#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
FILE *f;
char c=' ';
clrscr();
f=fopen("balaram.txt","a+");
if(f==NULL)
{
printf("\n can not open file");
exit(1);
}
printf("\n write data and to stop process press'#':");
while(c!='#')
{
c=getche();
fputc(c,f);
}
printf("\n contents read");
rewind(f);
while(!feof(f))
printf("%c",getc(f));
}

Writing & Reading of FILE using W+ MODE in C language

#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
FILE *f;
char c=' ';
clrscr();
f=fopen("kemp.txt","w+");
if(f==NULL)
{
printf("\n can not open file");
exit(1);
}
printf("write data and to stop process press '*':");
while(c!='*')
{
c=getche();
fputc(c,f);
}
rewind(f);
printf("\n contents read:");
while(!feof(f))
printf("%c",getc(f));
}

Appending DATA to a Pre-Existing FILE using C languge

#include<stdio.h>

#include<conio.h>

#include<process.h>

void main()

{

FILE *f;

char c;

clrscr();

printf("\n contents of file before appending");

f=fopen("balaram.txt","r");

while(!feof(f))

{
 
c=fgetc(f);

 printf("%c",c);

}

f=fopen("balaram.txt","a");

if(f==NULL)

{

 printf("File can not appending");

  exit(1);

}

printf("\n Enter string to append:");

while(c!='.')

{
 
c=getche();

  fputc(c,f);

}

fclose(f);

printf("\n contents of file after appending:\n");

f=fopen("balaram.txt","r");

while(!feof(f))

{

  c=fgetc(f);

  printf("%c",c);

}

}

Writing and reading Data from text FILE using C language

#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
FILE *f,*f1;
char c;
clrscr();
f=fopen("balaram.txt","w");
if (f==NULL)
{
printf("Cannot open file");
exit(1);
}
printf("write data and to stop press '.':");
while(c!='.')
{
c=getche();
fputc(c,f);
}
fclose(f);
printf("\n contents read:");
f1=fopen("balaram.txt","r");
while(!feof(f1))
printf("%c",getc(f1));
}

Biggest Number in Array

/*Biggest Number in array:*/
#include<stdio.h>
 main()
{
  int a[50],size,i,big;

  printf("\nEnter the size of the array: ");
  scanf("%d",&size);
  printf("\nEnter %d elements in to the array: ", size);
  for(i=0;i<size;i++)
      scanf("%d",&a[i]);

  big=a[0];
  for(i=1;i<size;i++){
      if(big<a[i])
           big=a[i];
  }
  printf("Largest element: %d",big);
 return 0;
}