primevalue.c

Add Code Here/C/primevalue.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+int checkPrimeNumber(int n);
+int main() {
+
+  int n1, n2, i, flag;
+
+  printf("Enter two positive integers: ");
+  scanf("%d %d", &n1, &n2);
+
+  // swap n1 and n2 if n1 > n2
+  if (n1 > n2) {
+    n1 = n1 + n2;
+    n2 = n1 - n2;
+    n1 = n1 - n2;
+  }
+
+  printf("Prime numbers between %d and %d are: ", n1, n2);
+  for (i = n1 + 1; i < n2; ++i) {
+
+    // flag will be equal to 1 if i is prime
+    flag = checkPrimeNumber(i);
+
+    if (flag == 1) {
+      printf("%d ", i);
+    }
+  }
+
+  return 0;
+}
+
+// user-defined function to check prime number
+int checkPrimeNumber(int n) {
+  int j, flag = 1;
+
+  for (j = 2; j <= n / 2; ++j) {
+
+    if (n % j == 0) {
+      flag = 0;
+      break;
+    }
+  }
+
+  return flag;
+}