Add Radix Sort in C folder

Data Structures and Algorithms/C/RadixSort.c

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+#include <stdio.h>
+
+int getMax(int arr[], int n);
+void countSort(int arr[], int n, int exp);
+void radixsort(int arr[], int n);
+void print(int arr[], int n);
+
+int main()
+{
+    int n;
+    printf("Enter the no. of integer numbers in the array: ");
+    scanf("%d", &n);
+
+    printf("Enter the integers:  \n");
+    int arr[n];
+    for (int i = 0; i < n; ++i)
+    {
+        int m = 0;
+        scanf("%d", &m);
+        arr[i] = m;
+    }
+    radixsort(arr, n);
+    printf("The sorted array is: \n");
+    print(arr, n);
+    return 0;
+}
+
+//function to get maximum value in arr[]
+int getMax(int arr[], int n)
+{
+    int mx = arr[0];
+    for (int i = 1; i < n; ++i)
+        if (arr[i] > mx)
+            mx = arr[i];
+    return mx;
+}
+
+// A function to do counting sort of arr[] according to
+// the digit represented by exp.
+void countSort(int arr[], int n, int exp)
+{
+    int output[n];
+    int i, count[10] = {0};
+
+    // Store count of occurrences in count[]
+    for (i = 0; i < n; ++i)
+        count[(arr[i] / exp) % 10]++;
+
+    // Change count[i] so that count[i] now contains actual
+    //  position of this digit in output[]
+    for (i = 1; i < 10; ++i)
+        count[i] += count[i - 1];
+
+    // make output array
+    for (i = n - 1; i >= 0; --i)
+    {
+        output[count[(arr[i] / exp) % 10] - 1] = arr[i];
+        count[(arr[i] / exp) % 10]--;
+    }
+
+    for (i = 0; i < n; ++i)
+        arr[i] = output[i];
+}
+
+void radixsort(int arr[], int n)
+{
+    // Find the maximum number to know number of digits
+    int m = getMax(arr, n);
+
+    // Do counting sort for every digit. Note that instead
+    // of passing digit number, exp is passed. exp is 10^i
+    // where i is current digit number
+    for (int exp = 1; m / exp > 0; exp *= 10)
+        countSort(arr, n, exp);
+}
+
+// function to print the array
+void print(int arr[], int n)
+{
+    for (int i = 0; i < n; ++i)
+        printf("%d ", arr[i]);
+}