Time delay in C - GeeksforGeeks

In this post, we will see how to give a time delay in C code. Basic idea is to get current clock and add the required delay to that clock, till current clock is less then required clock run an empty loop.

Here is implementation with a delay function.

// C function showing how to do time delay 
#include <stdio.h> 
// To use time library of C 
#include <time.h> 
  
void delay(int number_of_seconds) 
{ 
    // Converting time into milli_seconds 
    int milli_seconds = 1000 * number_of_seconds; 
  
    // Storing start time 
    clock_t start_time = clock(); 
  
    // looping till required time is not achieved 
    while (clock() < start_time + milli_seconds) 
        ; 
} 
  
// Driver code to test above function 
int main() 
{ 
    int i; 
    for (i = 0; i < 10; i++) { 
        // delay of one second 
        delay(1); 
        printf("%d seconds have passed\n", i + 1); 
    } 
    return 0; 
} 

Output:

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