C code for getting temperature in Raspberry Pi

temperature.c

#include <stdio.h>

int main(int argc, char *argv[]) 
{
   FILE *fp;

   int temp = 0;
   fp = fopen("/sys/class/thermal/thermal_zone0/temp", "r");
   fscanf(fp, "%d", &temp);
   printf("CPU Temp: %.2f°C\n", temp / 1000.0);
   fclose(fp);

   return 0;
}

Compile this code

$ gcc temperature.c -o temp

Then move this to a directory in path to run from anywhere

$ sudo mv ./temp /usr/local/bin/