fgets should stop when stdin ends

Question

I'm trying to use fgets to read from stdin, but in small blocks. My issue is that I'm not sure what fgets equals when at the end of stdin. From my code, it seems that it clearly isn't NULL or another end of line like \n. What is the proper way to do this?

Code (which loops forever since fgets never equals NULL):

int main () 
{   
    char str1[4];
    printf("Enter stuff: ");

    while (fgets(str1, sizeof str1, stdin) != NULL && 
           fgets(str1, sizeof str1, stdin) != "\n") {

        printf("Got here");
    }

    printf("%s\n",str1);
    return 0;
}

Answer 1

Change

while(fgets(str1, sizeof str1, stdin) != NULL && fgets(str1, sizeof str1, stdin) != '\n'){

to

while(fgets(str1, sizeof str1, stdin) != NULL){

or to

while(fgets(str1, sizeof str1, stdin)){

fgets returns a char*. You can't compare it to '\n' which is a char. This function, returns NULL when it encounters EOF. You can simulate EOF on stdin by pressing

• CTRL+Z on windows
• CTRL+D on linux