How to make this code shorter

Question

Hello I am having trouble making my code shorter , if anyone can help me it would be great thanks.

define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
int main(void)
{
int hightemp, lowtemp, highest = -41, lowest = 41, highestday, lowestday, sumhigh = 0, sumlow = 0;
float averagehigh, averagelow, averagetemp;

for (int i = 1; i <= 4; i++) {

do{
printf("Enter the high value for day %d: ", i);
scanf("%d", &hightemp);
printf("Enter the low value for day %d: ", i);
scanf("%d", &lowtemp);
if (lowtemp > hightemp && lowtemp <= 40 && lowtemp >= -40 || lowtemp > hightemp && hightemp <= 40 && hightemp >= -40 || hightemp > 40 || lowtemp > 40 || hightemp < -40 || lowtemp < -40)
{
lowtemp = -43;
hightemp = -45;
printf("Incorrect values, temperature must be in the range between -40 to 40, high must be greater than low.\n");
}
} while (lowtemp > hightemp && lowtemp <= 40 && lowtemp >= -40 || lowtemp > hightemp && hightemp <= 40 && hightemp >= -40 || hightemp > 40 || lowtemp > 40 || hightemp < -40 || lowtemp < -40);
if (highest < hightemp)
{
highest = hightemp;
highestday = i;
}
if (lowest > lowtemp)
{
lowest = lowtemp;
lowestday = i;
}
sumhigh = sumhigh + hightemp;
sumlow = sumlow + lowtemp;
}
averagehigh = (float)sumhigh / 4;
averagelow = (float)sumlow / 4;
averagetemp = (float)(sumhigh + sumlow) / 8;
printf("The average LOW (mean) temperature was: %0.2f\n", averagelow);
printf("The average HIGH (mean) temperature was: %0.2f\n", averagehigh);
printf("The average (mean) temperature was: %0.2f\n", averagetemp);
printf("The highest temperature was: %d, on day %d\n", highest, highestday);
printf("The lowest temperature was: %d, on day %d\n", lowest, lowestday);

return 0;
}

Answer 1

What this code does ?
then only i can make it short