Question

Trying to figure out how to read in multiple variables through a file. for example i know how to read in one, if i have a file called “datainput” which has the line of text “150” and then in my program if I have int value; and then scanf(“%d”, &value); when i run the program with the file it reads the file and then applies it to my variable. but what I am trying to do now is something similar but instead read in 2 values, so say in my text file i will have “3.1, 3.4” something like this and then put it on variable 1 and 2 something like that. anyone have any ideas?

Answer 1

To read in two values all you have to do is add an additional format specifier to the scanf() call:

scanf("%d %d", &value1, &value2); //reads two values

Also, just to note if you are reading from a file you need to use the function fscanf has a similar format to scanf except that you need pass a pointer to the file you are working with:

  char inFileName[] = "input.txt";

  FILE *inFile;

  /* open the input file */  
  inFile = fopen(inFileName, "r");

  fscanf(inFile, "%d %d", &value1, &value2); //reads two values from FILE inFile