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Author: santhosh-programmer

armstrong_number.c

@@ -0,0 +1,28 @@
+
+// C PROGRAM TO CHECK IF A NUMBER IS ARMSTRONG NUMBER
+
+#include<stdio.h>
+#include<math.h>
+int main()
+{
+    int a,i,b=0,c,d,e=0,sum=0;
+    printf("Enter a number: ");
+    scanf("%d",&a);
+    c=d=a;
+    while(c>0)
+    {
+        c/=10;
+        b++;
+    }
+    while(d!=0)
+    {
+        e=d%10;
+        sum+=pow(e,b);
+        d=d/10;    
+    }
+    if (a==sum)
+    printf("It is a armstrong number");
+    else
+    printf("It is not a armstrong number");
+    return 0;
+}

combinations_of_a_string.c

@@ -0,0 +1,33 @@
+
+// C PROGRAM TO FIND NUMBER OF COMBINATIONS ALLOWED FOR A STRING
+
+#include<stdio.h>
+#include<string.h>
+int fact(int a)
+{
+    if (a==0 || a==1)
+    return 1;
+    else
+    return a*fact(a-1);
+}
+int main()
+{
+    char arr[100];
+    int count,final;
+    printf("Enter string: ");
+    scanf("%s",arr);
+    int n=strlen(arr),ans=(fact(n));
+    char ch[26]={'a','s','d','f','g','h','j','k','l','z','x','c','v','b','n',
+    'm','q','w','e','r','t','y','u','i','o','p'};
+    for (int i=0;i<26;i++)
+    {   count=0;
+        for(int j=0;j<n;j++)
+        {   
+            if (ch[i]==arr[j])
+            count++;
+        }
+        ans=ans/fact(count);
+    }
+    printf("No of combinations: %d",ans);
+    return 0;
+}

decimal_and_integer_part_of_a_number.c

@@ -0,0 +1,14 @@
+
+// C PROGRAM TO FIND INTEGER AND DECIMAL PART OF A NUMBER
+
+#include<stdio.h>
+#include<math.h>
+int main()
+{
+    double a,b,c;
+    printf("Enter number: ");
+    scanf("%lf",&a);
+    b=modf(a,&c);
+    printf("Decimal part: %f\nInteger part: %f",b,c);
+    return 0;
+}

decimal_to_binary.c

@@ -0,0 +1,19 @@
+
+// C PROGRAM TO CONVERT DECIMAL TO BINARY NUMBER
+
+#include<stdio.h>
+int main()
+{
+    int a,b,c=0,d=1;
+    printf("Enter decimal number: ");
+    scanf("%d",&a);
+    while(a!=0)
+    {
+        b=a%2;
+        c+=b*d;
+        d*=10;
+        a=a/2;
+    }
+    printf("Binary number: %d",c);
+    return 0;
+}

factorial_of_a_number.c

@@ -0,0 +1,16 @@
+
+// C PROGRAM TO FIND FACTORIAL OF A NUMBER
+
+#include <stdio.h>
+int main()
+{   
+    int a,i,b=1;
+    printf("Enter number: ");
+    scanf("%d",&a);
+    for (i=1;i<=a;i++)
+    {
+        b=b*i;
+    }
+    printf("Factorial: %d",b);
+    return 0;
+}

factors_of_a_number.c

@@ -0,0 +1,17 @@
+
+// C PROGRAM TO FIND FACTORS OF A NUMBER
+
+#include<stdio.h>
+int main()
+{
+    int a;
+    printf("Enter number: ");
+    scanf("%d",&a);
+    printf("Factors: ");
+    for(int i=1;i<=a;i++)
+    {
+        if(a%i==0)
+        printf("%d ",i);
+    }
+    return 0;
+}

finding_berth_in_a_train.c

@@ -0,0 +1,22 @@
+
+// C PROGRAM TO FIND BERTH IN A TRAIN
+
+#include<stdio.h>
+#include<string.h>
+int main()
+{
+    int a;
+    printf("Enter seat number: ")
+    scanf("%d",&a);
+    if((a-4)%8==0 || (a-1)%8==0)
+    printf("Lower Berth");
+    else if ((a-2)%8==0 || (a-1)%4==0)
+    printf("Middle Berth");
+    else if ((a-3)%8==0 || (a-2)%4==0)
+    printf("Upper Berth");
+    else if (a%8==0)
+    printf("Side Upper Berth");
+    else
+    printf("Side Lower Berth");
+    return 0;
+}

input_and_print_array_elements_using_pointers.c

@@ -0,0 +1,37 @@
+
+// C program to input and print array elements using pointers
+
+#include <stdio.h>
+#define MAX_SIZE 100 // Maximum array size
+int main()
+{
+    int arr[MAX_SIZE];
+    int N, i;
+    int * ptr = arr;    // Pointer to arr[0] 
+
+    printf("Enter size of array: ");
+    scanf("%d", &N);
+
+    printf("Enter elements in array:\n");
+    for (i = 0; i < N; i++)
+    {
+        scanf("%d", ptr);
+
+        // Move pointer to next array element
+        ptr++;   
+    }
+
+    // Make sure that pointer again points back to first array element
+    ptr = arr;
+
+    printf("Array elements: ");
+    for (i = 0; i < N; i++)
+    {
+        // Print value pointed by the pointer
+        printf("%d, ", *ptr);
+
+        // Move pointer to next array element
+        ptr++;
+    }
+    return 0;
+}

nested_printf.c

@@ -0,0 +1,13 @@
+
+// C PROGRAM FOR NESTED PRINTF FUNCTION
+
+#include<stdio.h>
+int main ()
+{
+    int i=10,j=2;
+    printf("%d",printf("%d",printf("%d",printf("%d%d",i,j))));
+    // INNER MOST PRINTF PRINTS THE OUTPUT AND NEXT PRINTF PRINTS
+    // THE SIZE OF THE OUTPUT AND NEXT PRINTF PRINTS THE SIZE OF
+    // SECOND OUTPUT AND IT GOES ON...  
+    return 0;
+}

palindrome_number_or_not.c

@@ -0,0 +1,23 @@
+
+// C PROGRAM TO FIND A NUMBER IS PALINDROME OR NOT 
+
+#include <stdio.h>
+int main()
+{
+int a,b,rev=0,rem;
+printf("Enter the number: ");
+scanf("%d",&a);
+b=a;
+while(a>0)
+{
+rem=a%10;
+rev=(rev*10)+rem;
+a=a/10;
+}
+printf("Reverse number of %d is %d",b, rev);
+if(b==rev)
+printf("\n%d is palindrome\n",b);
+else
+printf("\n%d is not a palindrome\n",b);
+return 0;
+}

prime_number_or_composite_number.c

@@ -0,0 +1,19 @@
+
+// C PROGRAM TO FIND IF A NUMBER IS PRIME OR COMPOSITE
+
+#include<stdio.h>
+int main()
+{
+    int a,i;
+    printf("Enter number: ");
+    scanf("%d",&a);
+    for (i=2;i<a;i++)
+    {
+        if(a%i==0){
+        printf("composite");
+        break;}
+    }
+    if(i==a)
+    printf("prime");
+    return 0;
+}

print_diamond_star_pattern.c

@@ -0,0 +1,45 @@
+
+// C PROGRAM TO FIND DIAMOND STAR PATTERN
+
+#include <stdio.h>
+
+int main()
+{
+    int i, j, rows;
+    int stars, spaces;
+   
+    printf("Enter rows to print : ");
+    scanf("%d", &rows);
+    
+    
+    stars = 1;
+    spaces = rows - 1;
+    
+    /* Iterate through rows */
+    for(i=1; i<rows*2; i++)
+    {
+        /* Print spaces */
+        for(j=1; j<=spaces; j++)
+            printf(" ");
+        
+        /* Print stars */
+        for(j=1; j<stars*2; j++)
+            printf("*");
+        
+        /* Move to next line */
+        printf("\n");
+        
+        if(i<rows)
+        {
+            spaces--;
+            stars++;
+        }
+        else
+        {
+            spaces++;
+            stars--;
+        }
+    }
+    
+    return 0;
+}

print_upper_half_diamond_pattern.c

@@ -0,0 +1,20 @@
+
+// C PROGARM TO PRINT UPPER HALF DIAMOND PATTERN
+
+#include <stdio.h>
+int main() {
+   int i, space, rows, k = 0;
+   printf("Enter the number of rows: ");
+   scanf("%d", &rows);
+   for (i = 1; i <= rows; ++i, k = 0) {
+      for (space = 1; space <= rows - i; ++space) {
+         printf("  ");
+      }
+      while (k != 2 * i - 1) {
+         printf("* ");
+         ++k;
+      }
+      printf("\n");
+   }
+   return 0;
+}

scanf_inside_printf.c

@@ -0,0 +1,15 @@
+
+// C PROGRAM TO IMPLEMENT SCANF INSIDE PRINTF
+
+#include <stdio.h>
+int main()
+{
+	char a[100], b[100], c[100];
+	// scanf() with one input
+	printf("First scanf() returns : %d\n",scanf("%s", a));
+	// scanf() with two inputs
+	printf("Second scanf() returns : %d\n",scanf("%s%s", a, b));
+	// scanf() with three inputs
+	printf("Third scanf() returns : %d",scanf("%s%s%s", a, b, c));
+	return 0;
+}

structure_member_inside_another_structure.c

@@ -0,0 +1,20 @@
+
+// C PROGRAM TO IMPLEMENT NESTED STRUCTURE
+
+#include<stdio.h>
+struct student
+{
+    int rollno;
+};
+struct class
+{
+    struct student a;
+    char name[20];
+}var;
+int main()
+{
+    printf("Enter name and roll no: ");
+    scanf("%s%d",var.name,&var.a.rollno);
+    printf("Entered name: %s\nEntered rollno: %d",var.name,var.a.rollno);
+    return 0;
+}

sum_of_'n'_numbers.c

@@ -0,0 +1,11 @@
+
+// C PROGRAM TO FIND SUM OF 'N' NUMBERS
+
+#include<stdio.h>
+int main()
+{
+    int a;
+    printf("Enter number: ");
+    scanf("%d",&a);
+    printf("Sum: %d",a*(a+1)/2);
+}