DS-(I) Assignment 1: Set B-a)

a) Read the data from file 'cities.txt' containing names of cities and their STD codes. Accept a name of the city from user and use linear search algorithm to check whether the name is present in the file and output the STD code, otherwise output “city not in the list”.

Solution:

#include<stdio.h>
#include<string.h>
typedef struct city
{
    char name[20];
    int code;
}record;
record city[100];
int read_file(record *a)
{
    int i=0;
    FILE *fp;
    if((fp=fopen("cities.txt","r"))!=NULL)
    {
        while(!feof(fp))
        {
            fscanf(fp,"%s%d",a[i].name,&a[i].code);
            i++;
        }
    }
    return (i-1);
}
void l_search(record *a,int n,char x[20])
{
    int i;
    for(i=0;i<n;i++)
    {
        if(strcmp(a[i].name,x)==0)
        {
            printf("\n%s=%d\n",a[i].name,a[i].code);
            break;
        }
    }
    if(i==n)
        printf("\n%s City not in the list\n",x);
}
main()
{
    char x[20];
    int n;
    n=read_file(city);
    printf("\nEnter city name\n");
    gets(x);
    l_search(city,n,x);
}

File:

cities.txt