Create a File & Store Information
#include
#include
void main()
{
FILE *fptr;
char name[20];
int age;
float salary;
fptr = fopen("emp.rec", "w");
if (fptr == NULL)
{
printf("File does not exists \n");
return;
}
printf("Enter the name \n");
scanf("%s", name);
fprintf(fptr, "Name = %s\n", name);
printf("Enter the age\n");
scanf("%d", &age);
fprintf(fptr, "Age = %d\n", age);
printf("Enter the salary\n");
scanf("%f", &salary);
fprintf(fptr, "Salary = %.2f\n", salary);
fclose(fptr);
}
Output
Enter the name
raj
Enter the age
40
Enter the salary
4000000
Illustrate Reading of Data from a File
#include
#include
#include
void main()
{
FILE *fptr;
char filename[15];
char ch;
printf("Enter the filename to be opened \n");
scanf("%s", filename);
fptr = fopen(filename, "r");
if (fptr == NULL)
{
printf("Cannot open file \n");
exit(0);
}
ch = fgetc(fptr);
while (ch != EOF)
{
printf ("%c", ch);
ch = fgetc(fptr);
}
fclose(fptr);
}
Output
Enter the filename to be opened
pgm95.c
#include
#include
void main()
{
FILE *fptr;
char name[20];
int age;
float salary;
fptr = fopen ("emp.rec", "w"); /* open for writing*/
if (fptr == NULL)
{
printf("File does not exists \n");
return;
}
printf("Enter the name \n");
scanf("%s", name);
fprintf(fptr, "Name = %s\n", name);
printf("Enter the age \n");
scanf("%d", &age);
fprintf(fptr, "Age = %d\n", age);
printf("Enter the salary \n");
scanf("%f", &salary);
fprintf(fptr, "Salary = %.2f\n", salary);
fclose(fptr);
}
Delete a specific Line from a Text File
#include
#include
int main()
{
FILE *fileptr1, *fileptr2;
char filename[40];
char ch;
int delete_line, temp = 1;
printf("Enter file name: ");
scanf("%s", filename);
fileptr1 = fopen(filename, "r");
ch = getc(fileptr1);
` while (ch != EOF)
{
printf("%c", ch);
ch = getc(fileptr1);
}
rewind(fileptr1);
printf(" \n Enter line number of the line to be deleted:");
scanf("%d", &delete_line);
fileptr2 = fopen("replica.c", "w");
ch = getc(fileptr1);
while (ch != EOF)
{
ch = getc(fileptr1);
if (ch == '\n')
temp++;
if (temp != delete_line)
{
putc(ch, fileptr2);
}
}
fclose(fileptr1);
fclose(fileptr2);
remove(filename);
rename("replica.c", filename);
printf("\n The contents of file after being modified are as follows:\n");
fileptr1 = fopen(filename, "r");
ch = getc(fileptr1);
while (ch != EOF)
{
printf("%c", ch);
ch = getc(fileptr1);
}
fclose(fileptr1);
return 0;
}
Output
Enter file name: pgm1.c
#include
#include
int main()
{
long int decimalnum, remainder, quotient;
int i = 1, j, temp;
char hexadecimalnum[100];
printf("Enter any decimal number: ");
scanf("%ld", &decimalnum);
quotient = decimalnum;
while (quotient != 0)
{
temp = quotient % 16;
if (temp < 10)
temp = temp + 48;
else
temp = temp + 55;
hexadecimalnum[i++] = temp;
quotient = quotient / 16;
}
printf("Equivalent hexadecimal value of decimal number %d: ", decimalnum);
for (j = i - 1; j > 0; j--)
printf("%c", hexadecimalnum[j]);
return 0;
}
Enter line number of the line to be deleted: 10
#include
#include
int main()
{
long int decimalnum, remainder, quotient;
int i = 1, j, temp;
printf("Enter any decimal number: ");
scanf("%ld", &decimalnum);
quotient = decimalnum;
while (quotient != 0)
{
temp = quotient % 16;
if (temp < 10)
temp = temp + 48;
else
temp = temp + 55;
hexadecimalnum[i++] = temp;
quotient = quotient / 16;
}
printf("Equivalent hexadecimal value of decimal number %d: ", decimalnum);
for (j = i - 1; j > 0; j--)
printf("%c", hexadecimalnum[j]);
return 0;
}
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