Added previous assignments

Assignment 4/main.c

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+/*
+ *Student: S.K Soekhlal
+ * Number: 4860632
+ * Assignment: 3.3
+ */
+#include<stdio.h>
+#include<stdlib.h>
+#include<math.h>
+
+int is_prime(int number){       /*Function decleration and definition */
+    int x;
+            if(number < 2){     /*If number is 0 or 1, it is not prime*/
+            return 0;
+        }
+    for(x=2; pow(x,2)<=number; x++){  /*using for loop to determine if input is not prime*/
+        if (number%x == 0){  /*If remainder of input/x^2 = 0 then the number is not prime*/
+            return 0;
+        }
+    }
+    return 1;
+}
+
+int main(){
+    int lower_limit,upper_limit,i; /*Declaring variables*/
+    scanf("%d%d",&lower_limit,&upper_limit); /*Storing user input in lower and upper limit variables*/
+    for(i=lower_limit; i <= upper_limit; i++){  /*using for loop to call is_prime function to calculate if the number is prime*/
+        if(is_prime(i) == 1){
+            printf("%d\n",i);
+        }
+    }
+    return 0;
+}