Thread: Convert String type to Integer type

Working on a project and I have hit a wall. I created a RNG for a microcontroller where users can choose the upper limit of the RNG, so it would pick a number between 1 and upper limit. However, I am having to print this info into an LCD module. All the code works, except it will not print the actual generated number onto the LCD. I believe it is because due to the way the code works, the type for the variable is a String rather than an Integer (but I am not certain). Is there any way to convert a String type to an Integer type?

I have included some of the code below, this is not everything. This project is a combination of C language and Assembly.

Code:

int lower;
char upper;
int count;
char die;
char dieResult[4];



void printRandoms(int numFaces, int count)
{
    int i;
    int num = 1;
    
    for (i = 0; i < count; i++) {
        num = rand() % numFaces + 1;
        ASCII = '0' + num;
    }
    memset(dieResult, 0, 4);            //memset(result) is a char type
    i = log10(num);
    while (num != 0) {
        dieResult[i] = '0' + (num % 10);
        num /= 10;
        i--;
    }
}

void RNG()
{
    UART_Puts(MS7);
    UART_Puts(MS6);
    UART_Get();
    while (ASCII != '.') {
        die = die * 10 + (ASCII - '0');
        UART_Get();
    }
    upper = die;
    char *result;
    char buffer[20];
    printRandoms(upper, 1);
    sprintf(buffer, "Rolled d%d: %s", upper, dieResult);
    
    //int value;
    //value = atoi(dieResult);    //this was an attempt at converting string to int
    
    result = buffer;
    UART_Puts(result);
    DATA = 0x34;
    LCD_Write_Command();
    DATA = 0x08;
    LCD_Write_Command();
    DATA = 0x02;
    LCD_Write_Command();
    DATA = 0x06;
    LCD_Write_Command();
    DATA = 0x0f;
    LCD_Write_Command();
    char lcdOut[16];
    sprintf(lcdOut,"d%d: %s", upper, dieResult); //can replace %s with %p to print in hexadecimal
       //I think this doesnt print the dieResult because its a string and not an int
    //sprintf(lcdOut,"d%d: %s", upper, dieResult);
    LCD_Puts(lcdOut);        //this doesn't work. Seems like dieResult has some memory error
    //free(result);            //cant have this free() as it isnt a pointer allocated via malloc()
    //die = 0;
}

Honestly I have no idea, it is a group project and we cant seem to figure out sprintf for the dieResult. We could probably consolidate it into a single block but we just wanted to get it working first.

Those variables are used in other portions of the code. Same with ASCII, it is apart of the Assembly code that I didnt include.

You may as well delete the whole function and just do

Code:

int roll = (rand() % die) + 1;
sprintf(buffer, "Rolled d%d: %d", die, roll);

When doing this, I no longer receive a random generated number it always outputs the same number.

And the dice is not always 12 sided, the user gets to choose how many sides the dice will have.