I have a task. I created eight functions and these functions work perfect. I have a problem with 4. step
In the instruction I have 4 steps 1. I need to create header file in which I must put declaration of all function: (edited) The name of header file is textFunc.h
#define _RNM_HPP
int _strlen (char *tab);
int writeText(FILE *wp, char text[]);
int readText(FILE *wp, char text[], int max);
int copyText(char skad[],char dokad[],int max);
int allSigns(char text[]);
int notWhiteSigns(char text[]);
int words(char text[]);
int lines(char text[]);
#endif
#include <stdio.h>
#include <stdlib.h>
int _strlen (char *tab)
{
int i;
for (i = 0; tab[i] != '\0'; ++i);
return i;
}
int writeText(FILE *wp, char text[])
{
int len = _strlen(text);
for (int i = 0; i < len; i++) {
fputc (text[i], wp);
}
return _strlen(text);
}
int readText(FILE *wp, char text[], int max)
{
int length = _strlen(text);
int c, i;
max = 1000;
while( (c = fgetc(wp)) != EOF && i <= max )
{
fputc (text[i], wp);
i++;
}
text[i+1] = '\0';
if (i < max)
printf("Array is too big.");
return _strlen(text);
}
int copyText(char skad[],char dokad[],int max)
{
if (_strlen(skad) <= max)
{
int i;
for (i = 0; skad[i] != '\0'; ++i)
{
dokad[i] = skad[i];
}
dokad[i] = '\0';
}
return _strlen(dokad);
}
int allSigns(char text[])
{
int i;
for (i = 0; text[i] != '\0'; ++i);
return i;
}
int notWhiteSigns(char text[])
{
int sum = 0;
for (int i = 0; text[i] != '\0'; ++i)
{
if ((text[i] != ' ') && (text[i] != '\n') && (text[i] != '\t') && (text[i] != '\v'))
sum++;
}
return sum;
}
int words(char text[])
{
int i;
int sum = 0;
for (int i = 1; text[i] != '\0'; ++i)
{
if (text[i] == ' ' && text[i-1] != ' ' && (text[i] != '\n') && (text[i] != '\t') && (text[i] != '\v') && (text[i-1] != '\n') && (text[i-1] != '\t') && (text[i-1] != '\v'))
sum++;
}
if (text[i-1] != ' ');
sum++;
return sum;
}
int lines(char text[])
{
int i;
int sum = 1;
for (int i = 0; text[i] != '\0'; ++i)
{
if (text[i] == '\n')
sum++;
}
return sum;
}
int main (int argc, char *argv[])
{
char sentence[] = "C is \n a \n programming \t language";
printf("Show array: %s \n", sentence);
printf("All signs: %i\n not white signs: %i\n words: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
return 0;
}
Then I must create program with main function mainProgram.c
#include <stdio.h>
#include <stdlib.h>
#include "funTabTekst.h"
int main (int argc, char *argv[])
{
char sentence[] = "C is \n a \n programming \t language";
printf("Show array: %s \n", sentence);
printf("All signs: %i\n not white signs: %i\n words: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
return 0;
}
gcc -o mainProgram.x mainProgram.o textFunc.o
I have a problem with 4. step. I cant compile my source file I try
gcc -o textFunc.o textFunc.c
I get an error
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
I don't have main function, so I add them to textFunc.c
int main()
{
return 0;
}
compilation go with no errors, I have textFunc.o, but I always must put main function in every program?
Ok I have textFunc.o now I need mainProgram.o
so I try gcc -o mainProgram.o mainProgram.c but I get an error
gcc -o mainProgram.o mainProgram.c
mainProgram.c: In function ‘main’:
mainProgram.c:12:86: warning: passing argument 1 of ‘allSigns’ makes integer from pointer without a cast [-Wint-conversion]
igns: %i\n not white signs: %i\n words: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~~~~
In file included from mainProgram.c:3:0:
textFunc.h:8:5: note: expected ‘char’ but argument is of type ‘char *’
int allSigns(char);
^~~~~~~~
mainProgram.c:12:111: warning: passing argument 1 of ‘notWhiteSigns’ makes integer from pointer without a cast [-Wint-conversion]
s: %i\n words: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~~~~
In file included from mainProgram.c:3:0:
textFunc.h:9:5: note: expected ‘char’ but argument is of type ‘char *’
int notWhiteSigns(char);
^~~~~~~~~~~~~
mainProgram.c:12:128: warning: passing argument 1 of ‘words’ makes integer from pointer without a cast [-Wint-conversion]
\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~~~~
In file included from mainProgram.c:3:0:
textFunc.h:10:5: note: expected ‘char’ but argument is of type ‘char *’
int words(char);
^~~~~
mainProgram.c:12:145: warning: passing argument 1 of ‘lines’ makes integer from pointer without a cast [-Wint-conversion]
allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~~~~
In file included from mainProgram.c:3:0:
textFunc.h:11:5: note: expected ‘char’ but argument is of type ‘char *’
int lines(char);
^~~~~
/tmp/cc2xAejC.o: In function `main':
mainProgram.c:(.text+0x83): undefined reference to `lines'
mainProgram.c:(.text+0x94): undefined reference to `words'
mainProgram.c:(.text+0xa5): undefined reference to `notWhiteSigns'
mainProgram.c:(.text+0xb5): undefined reference to `allSigns'
collect2: error: ld returned 1 exit status
Edit2
I try write this on my terminal
gcc mainProgram.c textFunc.c -o my_program
I get an error
mainProgram.c: In function ‘main’:
mainProgram.c:12:77: warning: implicit declaration of function ‘allSigns’ [-Wimplicit-function-declaration]
tf("All signs: %i\n not white signs: %i\n words: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~~~~
mainProgram.c:12:97: warning: implicit declaration of function ‘notWhiteSigns’ [-Wimplicit-function-declaration]
not white signs: %i\n words: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~~~~~~~~~
mainProgram.c:12:122: warning: implicit declaration of function ‘words’ [-Wimplicit-function-declaration]
ds: %i\n lines: %i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~
mainProgram.c:12:139: warning: implicit declaration of function ‘lines’; did you mean ‘linie’? [-Wimplicit-function-declaration]
i\n", allSigns(sentence), notWhiteSigns(sentence), words(sentence), lines(sentence));
^~~~~
linie
/tmp/ccQteDqR.o: In function `main':
textFunc.c:(.text+0x3b6): multiple definition of `main'
/tmp/cc0VFNnF.o:mainProgram.c:(.text+0x0): first defined here
collect2: error: ld returned 1 exit status
Then I try write another way, creating makefile newMakeFile
my_program: textFunc.o mainProgram.o
gcc -o my_program textFunc.o mainProgram.o
textFunc.o: textFunc.c
gcc -o textFunc.o -c textFunc.c
mainProgram.o: mainProgram.c textFunc.h
gcc -o mainProgram.o -c mainProgram.c
and I get "make: The is nothing to do in 'newMakeFile'.
The most simple way to compile your code:
gcc mainProgram.c textFunc.c -o my_program
You have to update also the definition of the functions in textFunc.h as the same as in textFunc.c
#ifndef _RNM_HPP
#define _RNM_HPP
int _strlen (char *tab);
int writeText(FILE *wp, char text[]);
int readText(FILE *wp, char text[], int max);
int copyText(char skad[],char dokad[],int max);
int allSigns(char text[]);
int notWhiteSigns(char text[]);
int words(char text[]);
int lines(char text[]);
#endif
If you want to compile to file.o first. See the simple Makefile below:
my_program: textFunc.o mainProgram.o
gcc -o my_program textFunc.o mainProgram.o
textFunc.o: textFunc.c
gcc -o textFunc.o -c textFunc.c
mainProgram.o: mainProgram.c textFunc.h
gcc -o mainProgram.o -c mainProgram.c