Carbon emission calculator C language source program
1. Programming ideas
This program aims to implement a simple carbon emission calculator for calculating the carbon emissions generated by specific activities. Mainly by obtaining relevant data input by the user and calculating according to the preset carbon emission coefficient, the corresponding carbon emissions are finally obtained.

Second, the code implementation
c
include < stdio.h >

//Define the function to calculate carbon emissions
double calculateCarbonEmissions (double activityValue, double emissionFactor) {
return activityValue * emissionFactor;
}
int main () {
double travelDistance;
double fuelConsumption;
double electricityUsage;
double carbonEmission;

//Get the travel distance entered by the user (in kilometers)
printf ("Please enter the travel distance (in kilometers): ");
scanf ("% lf ", & travelDistance);
//Assume a carbon emission factor of 0.25 kg CO2 per kilometer for cars
double travelEmissionFactor = 0.25;
double travelCarbonEmission = calculateCarbonEmissions (travelDistance, travelEmissionFactor);

//Get the fuel consumption entered by the user (in liters)
printf (" Please enter the fuel consumption (liters ）: ");
scanf ("% lf", & fuelConsumption);
/Assume a carbon emission factor of 2.65 kg CO2 per liter
double fuelEmissionFactor = 2.65;
double fuelCarbonEmission = calculateCarbonEmissions (fuelConsumption, fuelEmissionFactor);

//Get the power consumption entered by the user (unit: kWh)
printf ("Please enter the power consumption (degree ）: ");
scanf ("% lf ", & electricityUsage);
//Assume that the carbon emission coefficient per kWh is 0.785 kg of carbon dioxide
double electricityEmissionFactor = 0.785;
double electricityCarbonEmission = calculateCarbonEmissions (electricityUsage, electricityEmissionFactor);

/Calculate the total carbon emissions
carbonEmission = travelCarbonEmission + fuelCarbonEmission + electricityCarbonEmission;

printf ("Total carbon emissions are:% .2f kg CO2\ n", carbonEmission);

return 0;
}


III. Code description
1. ** Header file **: Contains'stdio.h 'for use with standard input and output functions such as'printf' and'scanf '.
2. ** Function definition **: The calculateCarbonEmissions function takes the activity value and the carbon emission factor as parameters and returns the calculated carbon emissions.
3. ** Main function **:
- defines the variables used to store travel distance, fuel consumption, electricity consumption and carbon emissions.
- Get the travel distance, fuel consumption and electricity consumption input by the user through the'scanf 'function.
- Set the carbon emission factors of travel, fuel consumption and electricity consumption respectively, and call the 'calculateCarbonEmissions' function to calculate the carbon emissions of each activity.
- Add the carbon emissions of each activity, get the total carbon emissions and output.

In this way, through the above C language program, a simple carbon emission calculator function can be realized, and the carbon emissions can be calculated and output according to the relevant data input by the user.