مساعدة في حل واجب البرمجة

[WoooW_KSA]

سلام

انا جربت هذه الطريقة بس يقول انه عندي غلط ايش هو الله اعلم فارجو من احد ما ان يقول ما هو الخطأ

(( ^_^ انا كمان معايا هذا الواجب ^_^ ))

#include<stdio.h>

int main(void)
{
	int ID, G;
	char LG,A,B,C,D,F;

	printf("Pleas Enter your ID and your Grade :");
	scanf("%d%d", &ID, &G);

	{
		if (G >= 90)
		LG==A;
	else if (G>=80)
		LG==B;
	else if (G>=70)
		LG==C;
	else if (G>60)
		LG==D;
	else
		{LG==F;}

	}

	switch (LG)
	{
	case 1:
		printf("\nYour ID is %d and your Grade = %d and LG = %c",ID,G,LG);
		break;

	default:
		printf("\nPleas try again....\n");
	}

	return(0);
}

الكلام هو

------ Build started: Project: Test, Configuration: Debug Win32 ------
Compiling...
Test.c
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(9) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
c:\program files\microsoft visual studio 9.0\vc\include\stdio.h(306) : see declaration of 'scanf'
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(13) : warning C4553: '==' : operator has no effect; did you intend '='?
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(15) : warning C4553: '==' : operator has no effect; did you intend '='?
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(17) : warning C4553: '==' : operator has no effect; did you intend '='?
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(19) : warning C4553: '==' : operator has no effect; did you intend '='?
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(21) : warning C4553: '==' : operator has no effect; did you intend '='?
c:\s and settings\wooow\my s\visual studio 2008\projects\test\test\test.c(25) : warning C4700: uninitialized local variable 'LG' used
Build log was saved at "file://c:\s and Settings\WoooW\My s\Visual Studio 2008\Projects\Test\Test\Debug\BuildLog.htm"
Test - 0 error(s), 7 warning(s)
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

واشكرك يا مستر احمد على كل دروسك فقد كانت اكثر من كافية