how to get input from command line in c code example

Example 1: how to get user input in c

#include <stdio.h>
//this is for storing numbers
int main(){
	
    int age; //this makes a vairable for you to store the value in
    printf("enter in your age: "); //this prints a prompt for the user
    scanf("%d", &age); //this takes in the argument given and stores it
                       //into the address of age

	return 0;
}

Example 2: how to take inputs and give outputs from a file in c

#include<stdio.h>

int main()
{
    FILE *fp;
    char ch;
    fp = fopen("one.txt", "w");
    printf("Enter data...");
    while( (ch = getchar()) != EOF) {
        putc(ch, fp);
    }
    fclose(fp);
    fp = fopen("one.txt", "r");
 
    while( (ch = getc(fp)! = EOF)
    printf("%c",ch);
    
    // closing the file pointer
    fclose(fp);
    
    return 0;
}