#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <math.h>

int baseCheck (char *num , int srcBas){
	int i, tf=1;

	if (srcBas==2){
		for(i=0;i<strlen(num)-1;i++){
			if(num[i]!='0' && num[i] !='1')
				tf=-1;
		}
	}
	else if (srcBas==16){
		for (i=0;i<strlen(num)-1;i++){
			if((num[i] > '9' || num[i] < 'A') && ((num[i] > 'F') || (num[i] < 'a' && num[i] > 'f'))) {
				tf=-1;
			}
		}
	}



return tf;
}

int decimalV(char *num , int srcBas){  //Decimal Calculation
	int i ,j, tmpnum=0 ,tmp2=0;

	for(i=strlen(num)-2, j=0; i>=0;i--,j++){
		if(num[i] >= 'A' || num[i]<='Z'){
			tmpnum=num[i]-'A'+10;
		}
		else if (num[i] >='a' || num[i]<='z'){
			tmpnum=num[i]-'a'+10;
		}
		else if( num[i] >='0' || num[i] <= '9'){
			tmpnum=num[i]-'0';
		}
		else {
			printf("Error , Invalid Number");
			return 0;
		}

		tmp2=tmp2+((int)pow(srcBas,j)*tmpnum);
	}

 return tmp2;

}

char* destBas(int decimalnum , int destbase){ //Destination convertion
	int i,tmp ,size;
	char* ans;
	size=((int)(log(decimalnum)/log(destbase)) +1);
	ans=(char*)malloc(size*sizeof(char));
	for(i=strlen(ans)-2 ; i >= 0 ; i++){
		tmp=decimalnum%destbase;
		if(tmp>=0 || tmp <= 9){
			ans[i]=tmp+'0';
		}
		else if(tmp>='A'-10 || tmp <='Z'-10){
			ans[i]=tmp+'A'-10;
		}
		else if(tmp >='a'-10 || tmp <='z'-10){
			ans[i]=tmp+'a'-10;
		}
		decimalnum=decimalnum/destbase;
	}

	return ans;
}
char* baseConvert(char *num, int srcBas, int destBas){
	char *ans;

	if(srcBas<2 || srcBas >36){
		printf("Source base must be between 2 to 36!\n");
		return " ";
	}
	if(destBas<2 || destBas >36){
		printf("Destination base must be between 2 to 36!\n");
		return " ";
	}








return ans;

}



void main(){
	printf("%s\n", baseConvert("aBc", 16, 10));
	printf("%s\n", baseConvert("1646244", 10, 36));

}