fscanf not reading char from file

Question

I have a program that reads from a file and converts assembly code into VM machine code. Instructions have different datatypes depending on the opcode, so my reader looks like this:

while(!feof(inF)) {
    fscanf(inF, "%s",&temp); //analyse first string and branch into if statement 
        printf("%s\n", temp);
        if (strcmp(temp, "NOP") == 0 || strcmp(temp, "nop") == 0) {
            fprintf(outF, "%i\n", 0);
        }
        else if (strcmp(temp, "LDI") == 0 || strcmp(temp, "ldi") == 0) {
            opcode = LDI; //opcode 1
            fscanf(inF," %c %d", &r1, &immediate); //get r1 and immediate
            printf("R1: %i\n", r1);
            printf("I: %i\n", immediate);
            r1 = getReg(r1);
            r2 = 0;
            subop = 0;
            output = (opcode << 27)|(r1 << 24)|(r2 << 21)|(subop << 16)|(immediate);
            fprintf(outF, "%x\n", output);
        }        
}

With a line reading LDI A 1024 , I get an output of :

LDI
R1: 0
I: 1024

Instead of the expected

LDI
R1: 65
I: 1024

It appears that fscanf is not reading the char . I've looked at solutions that seemed to work for others and they don't seem to work here for some reason.

Answer 1

You have declared the variable immediate as unsigned short while the line

fscanf(inF," %c %d", &r1, &immediate);

supposes it is an integer. The behavior is undefined in such cases.