In this tutorial, you will learn to generate random numbers within a range in C programming. But before that, you may go through the topic below if you do not know about the** rand()** and

**function used in random numbers generation.**

`srand()`

Here we will use **srand()** function provided in C to generate random numbers. The current time will be used to seed the srand() function.

## C Program to generate random numbers within the range

Since the rand() will generate random numbers between 0 to max value, but instead of 0 we want to enter the lower range as well as the upper range so here is the trick we need to implement.

** (upRange - lrRange + 1))** then add the

**lower range**at the end.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #include <stdio.h> #include <stdlib.h> #include <time.h> int main() { int lrRange, upRange, n; //Number of random number you want printf("Enter how many random numbers you want: "); scanf ("%d", &n); //initial number printf("Enter the lower range: "); scanf ("%d", &lrRange); //the last number for random range printf("Enter the upper range: "); scanf ("%d", &upRange); srand(time(0)); printf("\n%d random numbers are: ", n); for (int i = 0; i < n; i++) { int num = (rand() % (upRange - lrRange + 1)) + lrRange; printf("%d ", num); } return 0; } |

**Output:**

`Enter how many random numbers you want: 7 `

Enter the lower range: 10

Enter the upper range: 50

7 random numbers are:

22 29 24 33 18 41 11

Again execute the program but this time entered for 10 random numbers, start from 1 and give upper range 7.

`Enter how many random numbers you want: 10 `

`Enter the lower range: 1 `

`Enter the upper range: 7 `

`7 random numbers are: `

`1 3 7 7 5 2 1 5 1 2`

Notice that the program is repeating the number as you requested for 10 random numbers but the range is limited to 7 numbers. Hence the program repeats the number.