//Variable declaration:
Tc1 = 25.0                  //Initial temperature of cold fluid (°C)
Th1 = 72.0                  //Initial temperature of hot fluid (°C)
Th2 = 84.0                  //Final temperature of hot fluid (°C)

//Calculation:
//From equation 14.2:
Tc2 = (Th2-Th1)+Tc1         //Final temperature of cold fluid (°C)

//Result:
printf("The final temperature of the cold liquid is : %f °C.",Tc2)
printf("There is a printing mistake in unit of final temperature in book.")