How to search on struct char c?

Question

#include<stdio.h>
#include<stdlib.h>  //libraries
#include<string.h>

#define ARRAY_SIZE 4 //define the array size is 4

Declare a Person structure containing the following two data members: name and age.

 struct Person
{
 char name[20];
 int age;
};

Define fillPersons function that takes an empty array of Persons, and fills the array.

 void fillPersons(struct Person * myPs);

For function using

 struct Person p[ARRAY_SIZE];

Define searchPerson function that takes an array of Persons, and the name to search for. The function will return the corresponding age if the person is found, -1 otherwise.

int searchPerson(struct Person * myPs, char * myName);

Define printPersons function that takes an array of Persons, and prints the content of the array.

void printPersons(struct Person * myPs);

Main Fuction

int main()
{
struct Person p[ARRAY_SIZE];
int a;
int isFound;
char myName[20];

Switch case for user interface

do
{
    printf("1)FILL ARRAY\n");
    printf("2)SEARCH BY NAME\n");
    printf("3)PRINT ARRAY\n");
    printf("4)EXIT\n");
    printf("Search Operation:");

    scanf_s("%d", &a);
    switch (a)
    {
    case 1:fillPersons(p); break;

I write the main part of searching but i cant fill the function.

    case 2:printf("\Give the name to search for:");
        scanf_s("%s", &myName);
        isFound = searchPerson(p, myName);
        if (isFound == -1)
        {
            printf("%s not avaible in the array. \n", myName);
        }
        else
        {
            printf("The age of %s is %d.\n", myName, isFound);
        }
        break;

After this part it is okay to read names and ages but cant do it searching part.

    case 3:printPersons(p); break; 
    case 4:printf("\nProgram exits ..."); exit(0);
    }
} while (a != 4);

system("pause");
return 0;
}

It is okay this scanf part

void fillPersons(struct Person * myPs)
{
    int i;
    for (i = 0; i < 4; i++)//defining 4 person i<4
    {
        scanf_s("%20s", p[i].name,_countof(p[i].name));//if i dont do _coutof 
        scanf_s("%d", &p[i].age);                      // i get null.ptr error 
    }                                                  //  on visiual studio   
}

Printing the student names and ages

void printPersons(struct Person * myPs)
{
    int i;
    for (i = 0; i < 4; i++)
    {
        printf("%s %d", p[i].name, p[i].age);
    }
}

But i dont know how to fill with inside on fuction?

  int searchPerson(struct Person * myPs, char * myName)

THE OUTPUT SHOULD BE LIKE THIS

First things first, compile your program, find and fix all the errors. Specifically, you call functions with *myPs but you access p[i].variable. So, the rule of SO is that you must post a minimal reproducible example and if you can't get it to compile, point out what errors you get when you try to compile. — KevinDTimm
– KevinDTimm, Commented Dec 19, 2016 at 18:57
One more thing, scanf_s("%s", &myName); is not ideal (use fgets instead). Regardless, the call should be scanf_s("%s", myName); — KevinDTimm
– KevinDTimm, Commented Dec 19, 2016 at 18:59
If you were sold a C++ course, you need to be informed that the course was missold. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Dec 19, 2016 at 18:59
@KevinDTimm when i compile it without the search function i get no error. — bgobekli
– bgobekli, Commented Dec 19, 2016 at 18:59

4386427 · Accepted Answer · 2016-12-19 19:08:25Z

2

Seems the function you are missing is strcmp to compare two strings.

It could be like:

int searchPerson(struct Person * myPs, char * myName)
{
    int i;
    for (i = 0; i < ARRAY_SIZE; i++)
    {
        if (strcmp(myPs[i].name, myName) == 0)
        {
            return myPs[i].age;
        }
    }
    return -1;
}

In general notice:

When you pass the array to a function as struct Person * myPs, you must use myPs inside the function. Further you should use the defined array size instead of hard coding a 4.

So your printPersons should be:

void printPersons(struct Person * myPs)
{
    int i;
    for (i = 0; i < ARRAY_SIZE; i++)
    {
        printf("%s %d", myPs[i].name, myPs[i].age);
    }
}

Same applies to fillPersons

edited Dec 19, 2016 at 19:08

answered Dec 19, 2016 at 19:03

4386427

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8 Comments

bgobekli Over a year ago

After using this as my fuction i get the error of couldn't find the name of

4386427 Over a year ago

@BatuhanGöbekli - did you fix the scanf problem? scanf_s("%s", &myName); -> scanf_s("%s", myName);

bgobekli Over a year ago

@ 4386427 help me please

4386427 Over a year ago

@BatuhanGöbekli - Don't know what you mean by i get the error of couldn't find the name of ! The name of what? Compile time error or run time error ?

bgobekli Over a year ago

when i write a name after that on searching i get the else part " not avaible in array "

|

UrbiJr · Accepted Answer · 2016-12-19 20:46:35Z

0

First thing, you put in your question all the functions except the one that is giving you problems: searchPerson.
Then, your error is with this instruction:

scanf_s("%s", &myName);

Accordingly that you declared myName as a char pointer, this way, you're assigning the string to the address of myName, not to the memory cells it's pointing to.

Instead, this should be:

scanf_s("%s", myName);

edited Dec 19, 2016 at 20:46

answered Dec 19, 2016 at 19:09

UrbiJr

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