C Exercises: Append multiple lines at the end of a text file
C File Handling : Exercise-10 with Solution
Write a program in C to append multiple lines at the end of a text file.
Assume that the content of the file test.txt is : test line 1 test line 2 test line 3 test line 4
Sample Solution:
C Code:
#include <stdio.h>
int main ()
{
FILE * fptr;
int i,n;
char str[100];
char fname[20];
char str1;
printf("\n\n Append multiple lines at the end of a text file :\n");
printf("------------------------------------------------------\n");
printf(" Input the file name to be opened : ");
scanf("%s",fname);
fptr = fopen(fname, "a");
printf(" Input the number of lines to be written : ");
scanf("%d", &n);
printf(" The lines are : \n");
for(i = 0; i < n+1;i++)
{
fgets(str, sizeof str, stdin);
fputs(str, fptr);
}
fclose (fptr);
//----- Read the file after appended -------
fptr = fopen (fname, "r");
printf("\n The content of the file %s is :\n",fname);
str1 = fgetc(fptr);
while (str1 != EOF)
{
printf ("%c", str1);
str1 = fgetc(fptr);
}
printf("\n\n");
fclose (fptr);
//------- End of reading ------------------
return 0;
}
Sample Output:
Append multiple lines at the end of a text file : ------------------------------------------------------ Input the file name to be opened : test.txt Input the number of lines to be written : 3 The lines are : test line 5 test line 6 test line 7 The content of the file test.txt is : test line 1 test line 2 test line 3 test line 4 test line 5 test line 6 test line 7
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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