Codes

//Q 6.
#include <stdio.h>

long power (int, int);

int main()
{
    int pow, num;
    long result;

    printf("Enter a number: \n");
    scanf("%d", &num);
    printf("Enter it's power: \n");
    scanf("%d", &pow);
    result = power(num, pow);
    printf("%d^%d is %ld", num, pow, result);
    return 0;
}

long power (int num, int pow)
{
    if (pow)
    {
        return (num * power(num, pow - 1));
    }
    return 1;
}


//Q 7.

#include<stdio.h>
#include<string.h>

int main() {
   char str[100], temp;
   int i, j = 0;

   printf("\nEnter the string :");
   gets(str);

   i = 0;
   j = strlen(str) - 1;

   while (i < j) {
      temp = str[i];
      str[i] = str[j];
      str[j] = temp;
      i++;
      j--;
   }

   printf("\nReverse string is :%s", str);
   return (0);
}


//Q 8.

#include <stdio.h>
#include <string.h>

void delchar(char *x,int a, int b);

void main()
{
char string[10];
int n,pos,p;

printf("Enter the string \n");
scanf("%s",string);
printf("Enter the position from where to delete: \n");
scanf("%d",&pos);
printf("Enter the number of characters to be deleted: \n");
scanf("%d",&n);
printf("Final string is: ");
delchar(string, n,pos);
}

// Function to delete n characters
void delchar(char *x,int a, int b)
{
if ((a+b-1) <= strlen(x))
  {
  strcpy(&x[b-1],&x[a+b-1]);
  puts(x);
  }
}

//Q 9.

#include <stdio.h>
#include <string.h>

struct employee
{
     int id;
     char name[30];
     int age;
     int salary;

};

int main()
{
     int i;
     struct employee record[10];

    for(i=0; i<10; i++)
     {
         printf("Enter details of employee %d :  \n", i+1);

         printf("Enter Id : ");
         scanf("%d", &record[i].id);
         printf("\n");

         printf("Enter Name : ");
         scanf("%s", record[i].name);
         printf("\n");

         printf("Enter Age : ");
         scanf("%d", &record[i].age);
         printf("\n");

         printf("Enter Salary : ");
         scanf("%d", &record[i].salary);
         printf("\n\n");


     }
     printf("\n");
     for(i=0; i<10; i++)
     {
         printf("Records of Employee : %d \n", i+1);
         printf("Id is: %d \n", record[i].id);
         printf("Name is: %s \n", record[i].name);
         printf("Age is: \n",record[i].age);
         printf("Salary is: \n",record[i].age);
          printf("\n");
     }
     return 0;
}


//Q 10.

#include <stdio.h>
struct student
{
    char name[50];
    int roll;
    float marks;
} s[10],*p[10];

int main()
{
    int i;
    int Pointer[10];
    for(i = 0; i< 10; i++){
        p[i] = &s[i];
    }

    printf("Enter information of students:\n");

    // storing information
    for(i=0; i<10; ++i)
    {
        s[i].roll = i+1;

        printf("\nFor roll number%d,\n",s[i].roll);

        printf("Enter name: ");
        scanf("%s",s[i].name);

        printf("Enter marks: ");
        scanf("%f",&s[i].marks);

        printf("\n");
    }

    printf("Displaying Information:\n\n");
    // displaying information
    for(i=0; i<10; ++i)
    {
        printf("\nRoll number: %d\n",i+1);
        printf("Name: ");
        puts(p[i]->name);
        printf("Marks: %.1f",p[i]->marks);
        printf("\n");
    }
    return 0;
}