How to Store Float Calculation Results in FLASH Memory on PIC16F877A Using MPLAB X IDE?

#include <xc.h>
#include <stdio.h>
#include <stdlib.h>

void main(void) {
    const char test[] __flash = "Hello, world!";

    char buf[8] = "";
    float cal_result = 25.67;

    // ftoa(cal_result, buf);
    sprintf(buf, "%.2f", cal_result);

    const char out[8] __flash = {buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]};

    while(1) {
        // Main loop
    }
}