square root attempt using function pointer

sample.c

-#include<stdio.h>
-int main(){
-
-    printf("welcome to my c-programming projects");
-}
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two.c

+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+
+int square(int n);
+int input_num();
+
+int main(){
+    int hold;
+    hold = input_num();
+    int (*fnt)(int);
+    fnt = &square;
+
+    printf("the square root: %d\n",fnt(hold));
+}
+
+
+int square(int n){
+    int res = n * n;
+    return res;
+}
+
+int input_num(){
+    char num[20];
+    printf("Enter the number for square: ");
+    fgets(num, sizeof(num), stdin);
+
+    return atoi(num);
+
+}
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