C语言else if 实例 C语言ctype函数实例 C语言多重嵌套if C语言else if 实例 // electric.c -- calculates electric bill #include <stdio.h> #define RATE1 0.13230 // rate for first 360 kwh #define RATE2 0.15040 // rate for next 108 kwh #define RATE3 0.30025 // rate for next 252 kwh #define RATE4 0.34025 // rate for over 720 kwh #define BREAK1 360.0 // first breakpoint for rates #define BREAK2 468.0 // second breakpoint for rates #define BREAK3 720.0 // third breakpoint for rates #define BASE1 (RATE1 * BREAK1) // cost for 360 kwh #define BASE2 (BASE1 + (RATE2 * (BREAK2 - BREAK1))) // cost for 468 kwh #define BASE3 (BASE1 + BASE2 + (RATE3 *(BREAK3 - BREAK2))) //cost for 720 kwh int main(void) { double kwh; // kilowatt-hours used double bill; // charges printf("Please enter the kwh used.\n"); scanf("%lf", &kwh); // %lf for type double if (kwh <= BREAK1) bill = RATE1 * kwh; else if (kwh <= BREAK2) // kwh between 360 and 468 bill = BASE1 + (RATE2 * (kwh - BREAK1)); else if (kwh <= BREAK3) // kwh betweent 468 and 720 bill = BASE2 + (RATE3 * (kwh - BREAK2)); else // kwh above 680 bill = BASE3 + (RATE4 * (kwh - BREAK3)); printf("The charge for %.1f kwh is $%1.2f.\n", kwh, bill); return 0; } C语言ctype函数实例 C语言多重嵌套if