Thread: I need help with function codes...............

Ex 961: Create a function that asks the name of a student to the user and display the information of the student.

Code:

#include<stdio.h>
#include<conio.h>

struct student{
    char name[50];
    int stid;
    int age;
};


void func(struct student *stu);
void func(struct student *s1);
void func(struct student s2);


int main(){
    struct student s1;
    printf("Enter student's name: ");
    scanf("%s",&s1.nome);
    printf("Digite a matricula do estudante: ");
    scanf("%d",&s1.matricula);
     printf("Digite a idade do estudante: ");
    scanf("%d",&s1.idade);
    return 0;
}


void func(struct student s2){
   printf(""Enter student's name thay you wanna have information: ");
   scanf("%s",&s2.name);
   if (s1.name=s2.name) //I wanna compare if they are the same
   func(&stu);//I wanna show the informations 
}


// this funcion is to show the information that are restered before
void func(struct student *stu) 
{
  printf("Output\nName: %s",stu.name);
  printf("\nStudent Id: %d",stu.stid);
  printf("\nAge: %d",stu.age);
}

Did you have a question?

Code:

//I wanna compare if they are the same

First of all, one = is the assignment operator, and two == is the equality operator.

But to compare strings, you need to use the "strcmp()" function from "string.h".

kikunha

You declare the function, "func()" three times,

Code:

void func(struct student *stu);
void func(struct student *s1);
void func(struct student s2);

and define it twice, but never call either one in main().

You should name each function with a different name, and only declare and define each function once.

This program should never compile, at least correctly.

Code:

Code:

#include<stdlib.h>
#include<string.h>


            struct aluno{
               char name [40];
               const char grade[40];
               const char name2[40];
               int  student_id;


            };


void setAluno (struct aluno x[]);
void showAluno (struct aluno x[]);




main(){


    struct aluno sujeito[2];


    setAluno(sujeito);
    showAluno(sujeito);


}


void setAluno (struct aluno x[]){
    int i;


    for (i = 0; i < 2; i++){
        printf("\nEnter with Student ID %student: ", i+1);
        scanf("%d", &x[i].student_id);


        printf("Enter with the name %student: ", i+1);
        scanf("%s%*c", &x[i].name);


        printf("Enter with the grade: ", i+1);
        scanf("%s%*c", &x[i].grade);
    }
}


void showAluno (struct aluno x[]){
    int i;
    char name2;
    printf("\nEnter with the grade: ");
    scanf("%s%*c",name2);


    for (i = 0; i < 2; i++){
            if(strcmp(name2,x[i].name)==0){


            printf("Id: %d  Name: %s\nGrade: %s\n" , x[i].student_id, x[i].name, x[i].grade);
            }else{
            printf("dosen't have students in this grade \n\n");
            }
            break;
            }


    system ("pause");
}

it doesn't work..........i wanna show the students that are scribed in one grade

for example
id1 : 11
name 1 : wesley
grade: Math

id2: 12
name2: Robert
grade: English

Enter with the grade:
Math

id: 11 name: wesley grade:math

Compile with full warnings.

Code:

/*
main.c|21|warning: return type defaults to 'int'|
main.c||In function 'setAluno':|
main.c|39|warning: implicit declaration of function 'printf'|
main.c|39|warning: incompatible implicit declaration of built-in function 'printf'|
main.c|39|warning: format '%s' expects type 'char *', but argument 2 has type 'int'|
main.c|40|warning: implicit declaration of function 'scanf'|
main.c|40|warning: incompatible implicit declaration of built-in function 'scanf'|
main.c|43|warning: format '%s' expects type 'char *', but argument 2 has type 'int'|
main.c|44|warning: format '%s' expects type 'char *', but argument 2 has type 'char (*)[40]'|
main.c|47|warning: too many arguments for format|
main.c|48|warning: format '%s' expects type 'char *', but argument 2 has type 'const char (*)[40]'|
main.c||In function 'showAluno':|
main.c|56|warning: incompatible implicit declaration of built-in function 'printf'|
main.c|57|warning: incompatible implicit declaration of built-in function 'scanf'|
main.c|57|warning: format '%s' expects type 'char *', but argument 2 has type 'int'|
main.c|61|warning: passing argument 1 of 'strcmp' makes pointer from integer without a cast|
\include\string.h|43|note: expected 'const char *' but argument is of type 'char'|
main.c|57|warning: 'name2' is used uninitialized in this function|
||=== Build finished: 0 errors, 15 warnings ===|
*/

Some of these are from not including "stdio.h".

Right off the bat, line 55 declares a single char variable, but you're trying to use it as a string.

Code:

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


            struct aluno{
	   	    char nome [40];
		   	char disciplina[40];
		   	char discipliana2[40];
		   	int  matricula;
		   	
            };


void setAluno (struct aluno x[]);
void showAluno (struct aluno x[]);




main(){


    struct aluno sujeito[2];


    setAluno(sujeito);
    showAluno(sujeito);


}


void setAluno (struct aluno x[]){
    int i;


    for (i = 0; i < 2; i++){
        printf("\nDigite a matricula do %do aluno: ", i+1);
        scanf("%d", &x[i].matricula);


        printf("Digite o nome do %do aluno: ", i+1);
        scanf("%s%*c", &x[i].nome);


        printf("Entre com o nome da disciplina: ", i+1);
        scanf("%s%*c", &x[i].disciplina);
    }
}


void showAluno (struct aluno x[]){
    int i;
    char disciplina2[40];
    printf("\nDigite a disciplina do aluno: ");
    gets(disciplina2);


    for (i = 0; i < 2; i++){
			if (strcmp(disciplina2,x[i].matricula)==0){
            printf("Matricula: %d  Nome: %s\nDisciplina: %s\n" , x[i].matricula, x[i].nome, x[i].disciplina);
            }else{
            printf("NAO matriculado\n\n");
            }
			break;
			}


    system ("pause");
}

it's almost work.......the second doesn't just the first.........
matricula=student_id
disciplina=grade

i'm compare grades now.............

You still have warnings that need to be addressed.

Code:

/*
main.c|21|warning: return type defaults to 'int'|
main.c||In function 'setAluno':|
main.c|44|warning: format '%s' expects type 'char *', but argument 2 has type 'char (*)[40]'|
main.c|48|warning: format '%s' expects type 'char *', but argument 2 has type 'char (*)[40]'|
main.c||In function 'showAluno':|
main.c|61|warning: passing argument 2 of 'strcmp' makes pointer from integer without a cast|
\include\string.h|43|note: expected 'const char *' but argument is of type 'int'|
||=== Build finished: 0 errors, 4 warnings ===|
*/

If you're not seeing these, figure out how to increase the warnings generated by your compiler.

Look at the very last warning I posted ... it mentions something important about types.

[code]

scanf("%s%*c", &x[i].disciplina);

[\code]

my problem is here...........so how i can keep 2 names and call them using for..............gets?

Don't use "gets()"!!!
FAQ > Why gets() is bad / Buffer Overflows - Cprogramming.com
FAQ > Get a line of text from the user/keyboard (C) - Cprogramming.com

Code:

/*
string.h|43|note: expected 'const char *' but argument is of type 'int'|
*/

Code:

if (strcmp(disciplina2,x[i].matricula)==0)

What type is "disciplina2"?
What type is ".matricula"?