error in output not printing whats in choice

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

void SAVINGS();
int main(){
clrscr();
SAVINGS();
getch();
return 0;
}

void SAVINGS(){
int W,D,B,NB;
char ch;
printf("Enter Account Balance: \t \n");
scanf("%d",&B);
printf("\n\n");
printf("[1] Withdraw    [2] Deposit\t\n");
scanf("%s",ch);

    if (ch=1){
        printf("\n\n");
        printf("Enter a negative value for withdrawal:\t\n");
        scanf("%d",&W);
        NB=B+W;
        printf("\n\n");
        printf("Your new account balance is: %d\t\n",NB);
            if(NB<0){
                printf("Insufficient Fund!\n");
            }
        }

    else if(ch=2){
        printf("\n\n");
        printf("Enter positive value for deposit: \t\n");
        scanf("%d",&D);
        NB=B+D;
        printf("\n\n");
        printf("Your new account balance is: %d\t",NB);
        }
}