Naima

1....
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i,flag=0,count=1;
    char str[20],ch;
    int pos[27];
    printf("Enter any string : ");
    gets(str);
    for(int i=0;i<26;i++)
    {
        pos[i]=-1;
    }
    int cnt=1;
    for(int i=0;str[i]!='\0';i++)
    {
        if(str[i]==' ')
            continue;
        else
        {
            int c=str[i]-'a';
            if(pos[c]==-1)
                pos[c]=cnt;
            cnt++;
        }
    }
    printf("\n Enter character to be searched :");
    scanf("%c",&ch);
    int x=ch-'a';
    if(pos[x]!=-1)
    {
      printf("position of %c in the string is :%d\n",ch,pos[x]);
    }
    else
    {
        printf("Not found");
    }
    return 0;
}
.............................
2...
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
struct point
{
    int x,y;
};



int main()
{
    point P,Q;
    printf("Enter the x,y coordinates of first location \n");
    scanf("%d %d",&P.x,&P.y);
     printf("Enter the x,y coordinates of second location \n");
    scanf("%d %d",&Q.x,&Q.y);
    int manhattandis=abs(P.x-Q.x)+abs(P.y-Q.y);
    printf("The Manhattan distance between them %d\n",manhattandis);
    return 0;
}


3...............
#include<stdio.h>



int main()
{
    int arr[100];
    int n=15;
    int *ptr=arr;
    for(int i=0;i<n;i++)
    {
        scanf("%d",ptr);
        ptr++;
    }
    ptr=arr;
    for(int i=0;i<n;i++)
    {
        printf("%d ",*ptr);
        ptr++;
    }
}
..................
4...
#include<stdio.h>


struct student
{
    char name[30];
    int id;
    char dept[20];
    float cgpa;
};


int main()
{
    student S[3];
    FILE *fp;
    char str[100];
    fp=fopen("student.txt","r");
    if(fp==NULL)
    {
        printf("Error opening file");
        return 0;
    }
    while(fgets(str,100,fp)!=NULL)
    {
        printf("%s\n",str);
    }
    fclose(fp);
    return 0;
}
..........
5.

#include <stdio.h>

#define N 100

void transposematrix(int arr[N][N])
{
     int row,col;
   printf("Enter the number of Row\n");
   scanf("%d",&row);
   printf("Enter the number of column\n");
   scanf("%d",&col);
   printf("Enter the numbers\n");
   for(int i=0;i<row;i++)
   {
       for(int j=0;j<col;j++)
       {
           scanf("%d",&arr[i][j]);
       }
   }
   printf("The Transpose Matrix is:\n");
    for(int i=0;i<col;i++)
    {
        for(int j=0;j<row;j++)
        {
            printf("%d ",arr[j][i]);
        }
        printf("\n");
    }
}


int main()
{
    int arr[N][N];
   transposematrix(arr);
   return 0;
}


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

#define N 100

void mirrormatrix(int arr[N][N])
{
     int row,col;
   printf("Enter the number of Row\n");
   scanf("%d",&row);
   printf("Enter the number of column\n");
   scanf("%d",&col);
   for(int i=0;i<row;i++)
   {
       for(int j=0;j<col;j++)
       {
           scanf("%d",&arr[i][j]);
       }
   }
   printf("The Mirror Matrix is:\n");
    for(int i=0;i<row;i++)
    {
        for(int j=col-1;j>=0;j--)
        {
            printf("%d ",arr[i][j]);
        }
        printf("\n");
    }
}


int main()
{
    int arr[N][N];
   mirrormatrix(arr);
   return 0;
}



7.
#include <stdio.h>
#define MAX_SIZE 100  // Maximum string size
#define MAX_CHARS 255 // Maximum characters allowed


int main()
{
    char str[MAX_SIZE];
    int freq[MAX_CHARS]; // Store frequency of each character
    int i = 0, max;
    int ascii;

    printf("Enter any string: ");
    gets(str);

    /* Initializes frequency of all characters to 0 */
    for(i=0; i<MAX_CHARS; i++)
    {
        freq[i] = 0;
    }


    /* Finds frequency of each characters */
    i=0;
    while(str[i] != '\0')
    {
        ascii = (int)str[i];
        freq[ascii] += 1;

        i++;
    }


    /* Finds maximum frequency */
    max = 0;
    for(i=0; i<MAX_CHARS; i++)
    {
        if(freq[i] > freq[max])
            max = i;
    }


    printf("Maximum occurring character is '%c' = %d times.", max, freq[max]);

    return 0;
}