Question

Question 7 (a) Write a C program that performs the following tasks: 1. Create a text file to store a list of numbers. 2. Read a number entered by a user and store it into the text file until a negative number is entered. (b) Write a C program that performs the following tasks: 1. Open the text file that contains a list of numbers. 2. Print the list of numbers stored in the text file on the screen.

Answer 1

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(a) C-PROGRAM TO STORE NUMBER IN FILE

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#include <stdio.h>

void main() {
/*declare a FILE pointer*/
FILE *filePointer;
/*declare int variable number to read number from user*/
int number;
  
/* open the File "ListOfNumbers.txt" in write mode and store in filePointer*/
filePointer = fopen("ListOfNumbers.txt", "w");
  
if (filePointer == NULL)
{
printf("File ListOfNumbers.txt cannot be created!");
}
else
{
number = 0;/*initialize number to 0*/
while(!(number<0)) /*as long as number is not negative*/
{
printf("Enter number (negative number to stop): ");
scanf("%d", &number);/*read the number*/
/*if number is not negative, write the number in file*/
if(!(number<0))
fprintf(filePointer,"%d\n",number);
}
printf("\nThe file ListOfNumbers.txt created successfully!");
}
  
/* close filePointer*/
fclose(filePointer);
}

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CONSOLE OUTPUT

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Enter number (negative number to stop): 5
Enter number (negative number to stop): 10
Enter number (negative number to stop): 15
Enter number (negative number to stop): 20
Enter number (negative number to stop): 25
Enter number (negative number to stop): 30
Enter number (negative number to stop): 35
Enter number (negative number to stop): 40
Enter number (negative number to stop): -100

The file ListOfNumbers.txt created successfully!

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GENERATED FILE ( ListOfNumbers.txt )

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с ListOfNumbers.txt 5 10 15 20 25 30 35 40

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(b) C-PROGRAM TO READ NUMBERS FROM FILE

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#include <stdio.h>

int main()
{
FILE * filePointer; /*declare a File pointer filePointer*/
int number; /*declare integer variable number to read integer into*/
  
/*open NumberList.txt file in read mode*/
filePointer = fopen("NumberList.txt", "r");
  
printf("The numbers in the file NumberList.txt are:\n");
/*read first number from file in number variable*/
fscanf (filePointer, "%d", &number);
while (!feof (filePointer)) /*as long as file is not ended*/
{
printf ("%d\n", number);/*print the number variable in console*/
fscanf (filePointer, "%d", &number); /*read the next number from the file*/   
}
// close the file
fclose(filePointer);
}

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INPUT TEXT FILE (NumberList.txt)

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Numberlist.txt LC 51 55 65 173 끼 85 103

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OUTPUT IN THE CONSOLE

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The numbers in the file NumberList.txt are:
51
55
65
73
77
85
103