Add a file full of widely used C functions

tricks.c

@@ -0,0 +1,143 @@
+#include <stdio.h>
+#include <stdlib.h>	
+#define MAX 101
+#define SWAP(X, Y, T) (T=X, X=Y, Y=T)
+#define COMPARE(X,Y) ((X<Y)?-1:(X==Y)?0:1)
+void create_array(int a[], int n)
+{
+	int j;
+	for (j = 0; j < n; j++)
+		scanf("%d", &a[j]);	
+}
+void random_array(int list[], int n)
+{
+	int i;
+	if ((n<1)||(n>MAX))
+	{
+		fprintf(stderr, "Improper value of n\n");
+		exit(EXIT_FAILURE);
+	}
+	for (i = 0; i < n; ++i)
+	{
+		list[i] = rand()%1000;
+		printf("%d ", list[i]);
+	}
+	printf("\n");
+}
+void print_array(int a[], int n)
+{
+	int j;
+	for (j = 0; j<n; j++)
+	{
+		printf("%d ", a[j]);
+	}
+	printf("\n");
+}
+int sum_array(int a[], int n)
+{
+	int i, sum = 0;
+	for (i = 0; i < n; i++)
+		sum += a[i];
+	return sum;
+}
+int isPrime(int n)
+{
+    if(n <= 1) 
+        return 0;
+    if(n <= 3) 
+        return 1;
+    if (n % 2 == 0 || n % 3 == 0) 
+        return 0;
+    int i = 5;
+    while(i * i <= n)
+    { 
+        if (n % i == 0 || n % (i + 2) == 0)
+            return 0;
+        i += 6
+    }
+    return 1;
+}
+void selection_sort(int a[], int n)
+{
+	int i, j, min, temp;
+	for (i = 0; i < n-1; ++i)
+	{
+		min = i;
+		for (j = i+1; j < n; ++j)
+		{
+			if (a[j]<a[min])
+			{
+				min = j;
+			}
+		}
+		SWAP(a[min], a[i], temp);
+	}
+}
+void bubble_sort(int a[], int n)
+{
+   int i, j, t; 
+   for (i = 0; i < n-1; i++)          
+       for (j = 0; j < n-i-1; j++)  
+           if (a[j] > a[j+1]) 
+              SWAP(a[j], a[j+1], t); 
+}
+void linear_search(int a[], int size, int fai)
+{
+	int ele, c=0;
+	printf("Enter element\n");
+	scanf("%d", &ele);
+	for (int i = 0; i <=fai; ++i)
+	{
+		if (ele == a[i])
+		{
+			printf("Found it's position: %d\n", (i+1));
+			c++;
+		}
+	}
+	if (c == 0)
+	{
+		printf("Not Found\n");		
+	}
+}
+int dec2bin(int n)
+{
+	if (n < 2)
+		return n;
+	int x = 0, i = 0;
+	while(n != 0)
+	{
+		x += (n%2)*pow(10, i++);
+		n = n/2;
+	}
+	return x;
+}
+int binary_search(int a[], int ele, int left, int right)
+{
+	int middle;
+	if(left<=right)
+	{
+		middle = (left+right)/2;
+		switch(COMPARE(a[middle], ele))
+		{
+			case -1:return binary_search(a, ele, middle+1, right);
+			case 0:return middle;
+			case 1:return binary_search(a, ele, left, middle-1);
+		}
+		return -1;
+	}
+}
+int main()
+{
+	int t;
+	scanf("%d", &t); 
+	while(t--)
+	{
+		int n;
+		printf("Enter number of elements: ");
+		scanf("%d", &n);
+		char s[n];
+		fgets(s, sizeof(s), stdin);
+		int a[n];
+	}
+	return 0;
+}