Thread: Got Error in Pointer increment. Help !!!

Hey guys.. I am facing a problem when I try to compile these codes.. I am practicing on the Pointer increment.. Error I got was "error C2440: '=' : cannot convert from 'void *' to 'int' There is no context in which this conversion is possible"
Any idea what I did wrongly ? Thanks !!

Code:

#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
int main() {
    int *ptr, *tmp;

    ptr = malloc(10 * sizeof(int));
    tmp = ptr;
    int i;
    
    for (i = 0; i < 10; i++) {
        *ptr++ = 65 + i;
    }

    printf("List of integers : ");
    for (i = 0; i < 10; i++) {
        printf("%d ", tmp[i]);
    }
    printf("\n\n");
    
    printf("Reversed list of integers : ");
    for (i = 0; i < 10; i++) {
        printf("%d ", *--ptr);
    }
    printf("\n\n");

    ptr = tmp++;
    printf("The offset for pointer of integer when it is incremented : %d\n\n\n", tmp - ptr);
    return 0;
}

Code:

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

int main() {
    int *x = malloc(sizeof (int));
    x[0] = 0;
    int i = 1;
    while (1) {
        if (i > 3)
            break;
        x = realloc(x, i * sizeof (int));
        x[i] = 2 * i++;
    }
    for (i = 0; i < 3; i++) {
        printf("%d ", x[i]);
    }
    return 0;
}

Line 5 got error. Saying that error C2440: '=' : cannot convert from 'void *' to 'int'

I did save adi.. no idea whats wrong..

Make sure you are compiling as C program!
Is it the only error? How about realloc() line??

stdlib.h includes malloc() so delete that line - it probably should have been <alloc.h>, which you do NOT need here -- you already have malloc() in stdlib.h

Yes, there is an echo on this post!

The output is

1>------ Build started: Project: Program_executes, Configuration: Debug Win32 ------
1>Compiling...
1>Test2_Q1.cpp
1>c:\users\kokharng\documents\visual studio 2008\projects\program_executes\program_executes\te st2_q1.cpp(5) : error C2440: 'initializing' : cannot convert from 'void *' to 'int *'
1> Conversion from 'void*' to pointer to non-'void' requires an explicit cast
1>c:\users\kokharng\documents\visual studio 2008\projects\program_executes\program_executes\te st2_q1.cpp(11) : error C2440: '=' : cannot convert from 'void *' to 'int *'
1> Conversion from 'void*' to pointer to non-'void' requires an explicit cast
1>Build log was saved at "file://c:\Users\KokHarng\Documents\Visual Studio 2008\Projects\Program_executes\Program_executes\De bug\BuildLog.htm"
1>Program_executes - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

1>Test2_Q1.cpp

Wrong compiler - change your filename extension to dot c, or change your compiler options that are being used in your IDE.

It's not just int main(). It's either int main(void), or int main(int argc, char *argv[])

I am currently using Visual Studio 2008. Even I changed to .c extension still I got errors.

1>abc.c
1>c:\users\kokharng\documents\visual studio 2008\projects\testing\testing\abc.c(7) : error C2143: syntax error : missing ';' before 'type'
1>c:\users\kokharng\documents\visual studio 2008\projects\testing\testing\abc.c(9) : error C2065: 'i' : undeclared identifier

Only C99 only allows you to mix declarations and statements.
VC++ AFIAK is not C99 compliant.