C Program File Input & Output Example

C Program File Input & Output Example

How to write a C Program File Input & Output Example in C Programming Language ?


Solution For C Program :

//C Program File Input & Output.
#include <stdio.h>

int main(){
char inputFilename[80];
char outputFilename[80];

gets(inputFilename);
gets(outputFilename);

/*
* Read data from the file:
                1. open the file
                2. Read file
                3. Close the file
*/
FILE *input;
input = fopen(inputFilename, "r");

int n;
fscanf(input, "%d", &n);

int num[1005];
int i;
for( i = 0 ; i < n ; i++ ){
fscanf(input, "%d", &num[i]);
}

fclose(input);

/* Total count */
int sum = 0;
for( i = 0 ; i < n ; i++ ){
sum += num[i];
}

/*
* Write data to a file:
                1. open the file
                2. Write file
                3. Close the file
*/
FILE *output;
output = fopen(outputFilename, "w");

fprintf(output, "%d", sum);

fclose(output);

return 0;
}

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