Why is my C program skipping over if statements? [closed] - c

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I am a new coder and have no idea what I am doing please help!
The code is reading and taking inputs just fine until it reaches the scanf(" %c", &i);then it skips to the Amount print seemingly ignoring my if statements.Is there somthing wrong with my use of scanF?
Here is the code:
#include <stdio.h>
int main(){
printf("BANK ACCOUNT PROGRAM!\n--------------------\n");
char W,F,A,i,D;
int t=1;
double b,d;
while (t=1){
printf("Enter the old balance:\n");
scanf(" %lf", &b);
printf(" %lf", b);
if(b>=0)
{
printf("Enter the transactions now!\n Enter an F for the transaction type when you are finished.\n");
printf("Transaction Type (D=deposit, W=withdrawal, F=finished):\n");
scanf(" %c", &i);
if(i=F){
printf("Your ending balance is");
printf(" %lf", b);
printf("\n Program is ending!");
return 0;
}
if(i=W){
printf("Amount:");
scanf(" %f", &d);
b= b-d;
printf(" %f",b);}
}
if(b<0);
{
printf("The balance must be maintained above zero!\n");
}
}
return 0;
}

Answer 1

Because your comparison is wrong
if(i=F){ // this is assignment, not comparison
should be
if(i=='F'){ // note also it's comparison to character 'F'

Answer 2

In addition to wrong comparison operators, your way of comparing two chars is also wrong. If you want to check whether the input char i equals to 'F' , you should initialize the char variable F with character 'F', otherwise it would be just unintialized variable and comparison with that variable would be wrong.
You should add these lines just after you initialize F and W.
F = 'F';
W = 'W';
By the way, you can use another variable names like,
char var1 = 'F';
char var2 = 'W';