Thread: Reverse of a number

Code:

#include <stdio.h>


main()
{
    int num,rem,rev=0;
    printf ("Enter the number to be reversed:\n");


    scanf  ("d",&num);
    while (num>=1)


    {
        rem = num % 10;
        rev = (rev*10) + rem;
        num = num/10;
    }
    printf("The reverse of number is %d\n",rev);
    ;
}

The program compiles ,the output is:

output:

Enter the number to be reversed:
123
The reverse of number is 26.
press any key to continue

The output should be

Enter the number to be reversed:
123
The reverse of number is 321.
press any key to continue


---------------------------------------------------------------------------
Warnings and errors:

-------------- Build: Debug in reverse (compiler: GNU GCC Compiler)---------------


mingw32-gcc.exe -Wall -g -c C:\Users\Ram\Documents\reverse\main.c -o obj\Debug\main.o


C:\Users\Ram\Documents\reverse\main.c:3:1: warning: return type defaults to 'int' [-Wreturn-type]


C:\Users\Ram\Documents\reverse\main.c: In function 'main':



C:\Users\Ram\Documents\reverse\main.c:8:5: warning: too many arguments for format [-Wformat-extra-args]


C:\Users\Ram\Documents\reverse\main.c:18:1: warning: control reaches end of non-void function [-Wreturn-type]


mingw32-g++.exe -o bin\Debug\reverse.exe obj\Debug\main.o

Output file is bin\Debug\reverse.exe with size 28.71 KB

Process terminated with status 0 (0 minute(s), 0 second(s))

0 error(s), 3 warning(s) (0 minute(s), 0 second(s))



-------------- Run: Debug in reverse (compiler: GNU GCC Compiler)---------------


Checking for existence: C:\Users\Ram\Documents\reverse\bin\Debug\reverse.e xe
Executing: "C:\Program Files (x86)\CodeBlocks/cb_console_runner.exe" "C:\Users\Ram\Documents\reverse\bin\Debug\reverse. exe" (in C:\Users\Ram\Documents\reverse\.)

>> C:\Users\Ram\Documents\reverse\main.c:8:5: warning: too many arguments for format [-Wformat-extra-args]

This means something is wrong with your scanf call.

Code:

scanf  ("d",&num);

You are missing something in there. Look carefully.

---

"main()" returns an int, which is what the rest of those warnings are trying to tell you:

Code:

int main(void)
{
    // ...

    return 0;
}