章节号终于正常了
编程环境Visual Studio 2017
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#include <stdio.h> #include <float.h> /************************************************************************/ /* practice 1 */ /************************************************************************/ void p4_1(void) { char first_name[40]; char last_name[40]; printf("What's your first name:"); scanf_s("%s", first_name); printf("What's your last name:"); scanf_s("%s", last_name); getchar(); printf("%*s,%*s\n", 10, first_name, 10, last_name); return; } /************************************************************************/ /* practice 2 */ /************************************************************************/ void p4_2(void) { char first_name[40]; char last_name[40]; int first_name_length = 0; int last_name_lenght = 0; printf("What's your first name:"); scanf_s("%s", first_name); printf("What's your last name:"); scanf_s("%s", last_name); getchar(); first_name_length = strlen(first_name); last_name_lenght = strlen(last_name); printf("a.\"%s,%s\"\n", first_name, last_name); printf("b.\"%20s,%20s\"\n", first_name, last_name); printf("c.\"%-20s,%-20s\"\n", first_name, last_name); printf("d.%*s,%*s\n", first_name_length+3, first_name, last_name_lenght+3, last_name); return; } /************************************************************************/ /* practice 3 */ /************************************************************************/ void p4_3(void) { double input = 0.0; printf("please input the float number:"); scanf_s("%lf", &input); getchar(); printf("%lf\n", input); printf("%e\n", input); } /************************************************************************/ /* practice 4 */ /************************************************************************/ #define CM_PER_INCH (2.54) void p4_4(void) { float height_inch = 0; float height_cm = 0; printf("What's your height:"); scanf_s("%f", &height_inch); getchar(); printf("Dabney, you are %f feet tall\n", height_inch); height_cm = height_inch * CM_PER_INCH; printf("Dabney, you are %f cm tall\n", height_cm); } /************************************************************************/ /* practice 5 */ /************************************************************************/ void p4_5(void) { float network_speed = 0; float file_size = 0; float download_time = 0; printf("How much your network speed:"); scanf_s("%f", &network_speed); getchar(); printf("How much is your download file:"); scanf_s("%f", &file_size); getchar(); download_time = file_size / (network_speed / 8); printf("At %f megabits per secnod, a file of %f magebytes\n download in %f seconds.\n", network_speed, file_size, download_time); } /************************************************************************/ /* practice 6 */ /************************************************************************/ void p4_6(void) { char first_name[40] = { 0 }; char last_name[40] = { 0 }; int first_name_length = 0; int last_name_length = 0; printf("What's your first name:"); scanf_s("%s", first_name); getchar(); printf("What's your last name:"); scanf_s("%s", last_name); getchar(); first_name_length = strlen(first_name); last_name_length = strlen(last_name); printf("%s %s\n", first_name, last_name); printf("%*d %*d\n", first_name_length, first_name_length, last_name_length, last_name_length); printf("%s %s\n", first_name, last_name); printf("%-*d %-*d\n", first_name_length, first_name_length, last_name_length, last_name_length); } /************************************************************************/ /* practice 7 */ /************************************************************************/ void p4_7(void) { double d_value = 1.0 / 3.0; float f_value = 1.0 / 3.0; printf("the value of FLT_DIG:%d, the value of DBL_DIG:%d\n", FLT_DIG, DBL_DIG); printf("the value of double:%.6lf, the value of float:%.6lf\n", d_value, f_value); printf("the value of double:%.12lf, the value of float:%.12lf\n", d_value, f_value); printf("the value of double:%.18lf, the value of float:%.18lf\n", d_value, f_value); } /************************************************************************/ /* practice 8 */ /************************************************************************/ #define KM_PER_MILE (1.609) #define PINT_PER_GALLON (3.785) void p4_8(void) { float driven_distance = 0.0; float gas_consumption = 0.0; float pint_per_hundred_km = 0.0; float mile_per_gallon = 0.0; printf("How much distance have you traveled in kilometer:"); scanf_s("%f", &driven_distance); getchar(); printf("How much gas have you used in pint:"); scanf_s("%f", &gas_consumption); getchar(); pint_per_hundred_km = gas_consumption / driven_distance * 100; mile_per_gallon = (driven_distance / KM_PER_MILE) / (gas_consumption / PINT_PER_GALLON); printf("Fuel consumptions:%f pint/100km or %f mile/gallon\n", pint_per_hundred_km, mile_per_gallon); } int main(int argc, char **argv) { p4_8(); getchar(); } |
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答案一会导致内存溢出然后卡死。。去了*警告会消除。
嗯 运行环境Xcode
谢谢告知，*是打算拿来做占位符的，但是传的参数没传完整，因为书不在身边，所以先用10来代替了，改成
printf("%*s,%*s\n", 10, first_name, 10, last_name);这样就可以了为什么我用C-free编写第一个程序显示scanf_s("%s", first_name);有错误啊？
没用过C-free，你可以试试将scanf_s改成sacnf，看是否可以
好的，我回去试试！像我这样的新手学完 Cprimer plus应该看什么书！
你这些程序都是用什么IDE写的啊？
为啥第二题调用strlen函数不用string.h程序头？*直接用strlen函数可以少定义两个变量。