SPCA: Cheatsheet for Assignment 3

SPCA-assignment3-cheatsheet.c

/*
 *  =================================
 *  SPCA: Cheatsheet for Assignment 3
 *             Carl Friess
 *  =================================
 */


// Reading arguments
//  Example: $ nano myfile.txt
int main(int argc, char* argv[])
{

    // Number of arguments (aka length of the argv array)
    int numArguments = argc;        // 2

    // Program name
    char *firstArgument = argv[0];  // "nano"

    // First argument passed to the program
    char *secondArgument = argv[1]; // "myfile.txt"

}


// Create file pointer
FILE *fp = NULL;

// Use stdin
fp = stdin;

// Open a file for reading
fp = fopen("myfile.txt", "r");

// Read a single char
char c = fgetc(fp);

// Check if a char is white space
if (isspace(c)) {
    printf("'%c' is white space!", c);
}
else {
    printf("'%c' is not white space!", c);
}

// Read pattern from string
char string[] = "15th May";
int day;
char month[10];
sscanf(string, "%dth %s", &day, month);

// Read line from file
#define MAX_STRING_LENGTH   50
char line[MAX_STRING_LENGTH];
if (fgets(string, MAX_STRING_LENGTH, fp)) {
    /* Read successful */
}

// Write to file with format
fprintf(fp, "%dth %s\n", day, month);

// Closing a file when done with it
fclose(fp);