Question

C Programming Exercise:

Write a simple program in C so that takes a four charachter string from a file and puts it into a two dimensional array. Make sure your program satisfies the following:

(i) uses a 2D Array(rows and columns)

(ii) get and put functions

(iii) use multiple functions/methods :

-In your Main function take input from file using the get functions.

In your Second function, call it print2DArray, which takes the string from the file in main method and passes it to this function so that you put the string into a 2D Array. Then print the array back.

(iiii) Make sure your program handles the End of File exception correctly.

See Image For Example:

Example: File1 contains the following string: TTTT commandLine: ./TwoDAray < file1 Here is ny table: Example2: File1 contains the following string: ABCD commandLine:$ ./TwoDArray < file1 Here is ny table: A B C D

Answer 1

CODE:

#include <stdio.h> // header file for i/p o/p functions
void print2DArray(char c[4]){ // function to store characters into 2 dimensional array
char array[2][2]; // 2D Array declaration
int k=0,i,j; // required variable declaration
for(i=0;i<2;i++) // copying characters
for(j=0;j<2;j++){
array[i][j]=c[k];
k++;
}
printf("\n\nHere is my table: \n\n");
for(i=0;i<2;i++){ // printing 2D Array
for(j=0;j<2;j++)
printf("%c ",array[i][j]);
printf("\n");
}
}
int main ( int argc, char *argv[] ){ // main function
char str[4]; // single dimensional array declaration
int i=0;
if (argc != 2) /* argc should be 2 for correct execution */  
printf( "usage: %s filename", argv[0] ); /* argv[0] is the program name, where if command line argument is not given than program name is printed*/
else {
FILE *f = fopen( argv[1], "r" ); // argv[1] is a filename in which we read
if (f==0) /* fopen returns 0, the NULL pointer, on failure */
printf( "Could not open file\n" );
else {
char x;
printf("%s contains the following string: ",argv[1]);
while ((x=fgetc(f))!=EOF){ // read one character at a time from file, stopping at EOF, which indicates the end of the file.  
printf( "%c", x ); // priting characters
str[i]=x; // assigning to characters into single dimensional array
i++;
}
fclose(f); // closing file
}
}
print2DArray(str); // calling function
}// end of main

OUTPUT:

file1.txt contains the following string: tttt Here is my table: