Thread: Errors when compiling code.

Hello everyone,

I am very new at C programming and I am following the book from O'Reilly called "Practical C" 3rd Edition.

The exercise at the end of Chapter 1 ask to make a program to print your Name, Social Security number and Date of Birth. This is MY own code I came up with to do this:

Code:

/* This program is designed to produce a Name, Date of Birth and a SS number */


#include <stdio.h>


int dob;        /* Date of Birth */
int ssn;        /* SS Number */
int full_name;  /* Full Name */


int main()


{


        dob = 1981;
        ssn = 047237554;
        full_name = "John W Doe";


}


{


        printf("Hi, my name is %d.", full_name);
        printf("I was born on %d.", dob);
        printf("My SS number is %d.", ssn);
        return (0);


}

When I try to compile the program I get the following error:

Code:

Manuel-Velezs-MacBook-Pro:c_files Manolo$ cc -g -o exercise_1 exercise_1.c
exercise_1.c:14:8: error: invalid digit "9" in octal constant
exercise_1.c: In function ‘main’:
exercise_1.c:15: warning: assignment makes integer from pointer without a cast
exercise_1.c: At top level:
exercise_1.c:19: error: expected identifier or ‘(’ before ‘{’ token

I feel like I'm missing something really obvious and I'm gonna feel stupid once I can get an idea of what's going on but I love trying to learn this stuff! Thank you in advance for everyones help!

Ok so I scraped the other code and started over and I still can't get this. I'm sorry for all the obvious errors I might be making I'm just trying to go by the book but I'm not getting these parts that I am messing up. Here is the new code I created:

Code:

/* This program is designed to produce a Name, Date of Birth and a SS number */


#include <stdio.h>


/* Desfine Variables */


char first_name;                /* First Name of User */
char middle_name;       /* Middle Name of User */
char last_name;         /* Last Name of User */
int year_born;          /* Birth Date */
int current_year;       /* Current Year */
int age;                /* Age to Date */
int ssn_1;              /* First three numbers of your SS */
int ssn_2;              /* Middle two numbers of your SS */
int ssn_3;              /* Last four numbers of your SS */


int main()
{
        year_born = 1983;
        current_year = 2012;
        age = current_year - year_born;
        first_name = John;
        middle_name = W;
        last_name = Doe;
        ssn_1 = 045;
        ssn_2 = 68;
        ssn_3 = 3257;


                printf("Hello, my name is %s\n%s\n%s", first_name,middle_name,last_name);
                printf("This year I'm going to %d years old", age);
                printf("My SS number is %d\n%d\n%d\n", ssn_1,ssn_2,ssn_3);
                return(0);
}

Now I get the following error:

Code:

Manuel-Velezs-MacBook-Pro:c_files Manolo$ cc -g -o exercise_1 exercise_1.c
exercise_1.c: In function ‘main’:
exercise_1.c:22: error: ‘John’ undeclared (first use in this function)
exercise_1.c:22: error: (Each undeclared identifier is reported only once
exercise_1.c:22: error: for each function it appears in.)
exercise_1.c:23: error: ‘W’ undeclared (first use in this function)
exercise_1.c:24: error: ‘Doe’ undeclared (first use in this function)
exercise_1.c:29: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’
exercise_1.c:29: warning: format ‘%s’ expects type ‘char *’, but argument 3 has type ‘int’
exercise_1.c:29: warning: format ‘%s’ expects type ‘char *’, but argument 4 has type ‘int’
exercise_1.c:29: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’
exercise_1.c:29: warning: format ‘%s’ expects type ‘char *’, but argument 3 has type ‘int’
exercise_1.c:29: warning: format ‘%s’ expects type ‘char *’, but argument 4 has type ‘int’

I thought by maybe changing the variables around it might work but I guess I'm using them wrong.

Thank you for your help! I re did it the way you said and make the changes and it works. I have to read up on what you did because in the book we did not get that far in using those things you used in the code but I will study them and make sure I learn them. Again, thank you so much for your help!

Hey I got it to work a different way! I think I was trying to do too much too soon in the previous post I posted above! I did the following and it worked perfect with no errors:

Code:

/*
 *
 *Program created to print your Name, Date of Birth and SS Number
 *
 */


#include <stdio.h>


int ssn1;       /* First set of SSN */
int ssn2;       /* Second set of SSN */
int ssn3;       /* Third set of SSN */
int year1;      /* Current Year */
int year2;      /* Year Born */
int age;        /* Age Turning in Current Year */


int main()
{


/*
 * Set up of SSN veriables.
 */


        ssn1 = 145;
        ssn2 = 23;
        ssn3 = 3443;


/*
 *Set up of Year veriables.
 */


        year1 = 2012;
        year2 = 1983;


/*
 *Set up of Age veriable.
 */


        age = year1 - year2;


/*
 *Set up of Print Statements.
 */


                printf("Hello, my name is Manny I. Velez\n");
                printf("I was born on November 2nd, %d\n", year2);
                printf("This year, I'm going to be %d\n", age);
                printf("My Social Security number is %d %d %d\n", ssn1,ssn2,ssn3);


/*
 *End Program Statement
 */
                return (0);
}

But thank you for your help!!! I'm reading on the features you stated above and know it a tiny bit better now in what you did. I know I'll run into this in the near future and at least will have a heads up on it! Thanks!!!