CPrimerPlus02

编写程序的步骤

1.定义程序目标
2. 设计程序
3. 编写代码
4. 编译
5. 运行程序
6. 测试和调试程序
7. 维护和修改程序

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#include<stdio.h>void main(void) {    printf("Name is henry\n");    printf("Address is shanghai\n");    getchar();    return 0;}  

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years:#include<stdio.h>int  main() {    int ages, days;    ages = 22;    days = ages * 365;    printf("My age is %d\nThat is %d days!\n ",ages,days);    getchar();    return 0;}  printf method:#include<stdio.h>void print_first();void print_two();int  main() {    print_first();    print_first();    print_first();    print_two();    getchar();    return 0;}void print_first(void) {    printf("For he's a jolly good fellow!\n");}void print_two(void) {    printf("Which nobody can deney!\n");}  #include<stdio.h>int  main() {    int toes=0,sum=0,square=0;    toes = 10;    sum = toes + toes;    square = toes*toes;    printf("value:%d\nSum:%d\nsquare:%d\n",toes,sum,square);    getchar();    return 0;}  #include<stdio.h>void smile(void);int  main() {    smile();    return 0;}void smile(void) {    int n = 0; int j = 0;    for(n=1;n<=3;n++)    {        for (j = 1; j <= n; j++) {        printf("smile!");        }        printf("\n");    }    getchar();    return 0;}  output;smile!smile!smile!smile!smile!smile!---7.#include<stdio.h>void one_three();void two();void three();int main(void) {    printf("starting now:\n");    one_three();    two();    three();    printf("done!\n");        getchar();    return 0;}void one_three() {    printf("one\n");}void two() {    printf("two\n");}void three() {    printf("three\n");}---/*tall.c --身高显示*/#include<stdio.h>int main(void){    char name[20];    float tall = 0.0;    printf("Please input your name and tall by cm\n");    scanf("%s %f",name, &tall);    printf("%s, you are tall %f m", name,tall/ 100);    getchar();    getchar();    return 0;}---/*printf.c --对齐显示*/#include<stdio.h>#include<string.h>int main(void){    char first_name[20];    char last_name[20];    int a = 0, b = 0;    printf("Please input your first_name and last_name\n");    scanf("%s %s", first_name, last_name);    printf("%s %s\n", first_name, last_name);    printf("%*d %*d\n", strlen(first_name), strlen(first_name),strlen(last_name), strlen(last_name)); //    printf("%s %s\n", first_name, last_name);    printf("%-*d %-*d\n", strlen(first_name), strlen(first_name),strlen(last_name), strlen(last_name));    getchar();    getchar();    return 0;}Please input your first_name and last_namehenry tienhenry tien    5    4henry tien5     46./*printf.c --打印double和float*/#include<stdio.h>#include<float.h>int main(void){    double a = 1.0 / 3.0;    float b  = 1.0 / 3.0;    printf("double a=1.0/3.0 float b=1.0/3.0\n%.4e %.4f\n",a,b);    printf("%.12e %.12f\n",a,b);    printf("%.16e %.16f\n",a,b);    printf("%d\n",FLT_DIG);    printf("%d\n",DBL_DIG);    getchar();    getchar();    return 0;}