• 主干程序
• 初級版本
• 進階版本
• 版本進化

主干程序

• 輸入程序
• 解析程序

/*解析字符串 有空格把空格分開 比如輸入：add 1 2 解析后：add12*/ void do_parse(char *buf) {int state = 0;int i = 0;int argc = 0;char *argv[8] = {0};for (i = 0; buf[i]; i++){if (state == 0 && !isspace(buf[i])){state = 1;argv[argc++] = buf + i;}else if(isspace (buf[i])){state = 0;buf[i] = 0;}}argv[argc] = NULL;/*核心算法*/do_math(argc, argv); }int main() {char buf[1000] = {0};while (1){printf(">");scanf("%[^\n]%*c", buf);//輸入if (strcmp(buf, "exit") == 0)//如果輸入了"exit"就結束break;elsedo_parse(&buf);//解析程序} }

初級版本

void do_math(char * argc, char *argv[]) {if (strcmp(argv[0], "add") == 0){int a = atoi(argv[1]);//字符串轉(zhuǎn)a整形int b = atoi(argv[2]);//字符串轉(zhuǎn)b整形printf("%s + %s = %d\n", argv[1], argv[2], add(a, b));//打印加法結果a+b}else if (strcmp(argv[0], "sub") == 0){int a = atoi(argv[1]);int b = atoi(argv[2]);printf("%s - %s = %d\n", argv[1], argv[2], sub(a, b));} }

進階版本

int add(int a, int b) {return a + b; } int sub(int a, int b) {return a - b; } int(*pf)(int a, int b) = NULL; void do_math(char * argc, char *argv[]) {if (strcmp(argv[0], "add") == 0){pf = add;}if (strcmp(argv[0], "sub") == 0){pf = sub;}int a = atoi(argv[1]);int b = atoi(argv[2]);printf("%s + %s = %d\n", argv[1], argv[2], pf(a, b)); } #include<stdio.h> #include<stdlib.h>float add(float a, float b) {return a + b; } float sub(float a, float b) {return a - b; } float mul(float a, float b) {return a * b; } float div(float a, float b) {return a / b; }int main(void) {float(*operate[])(float, float) = { add,sub,mul,div };float number_a, number_b;float result;int oprate;printf("input the operator!1 +,2 -,3 *,4 /\n");scanf("%d", &oprate);printf("Input the number_a:");scanf("%f", &number_a);printf("Input the number_b:");scanf("%f", &number_b);printf("the result is %.3f\n",result = operate[oprate - 1](number_a, number_b));system("pause");return 0; }

這兩句關鍵程序

float(*operate[])(float, float) = { add,sub,mul,div }; result = operate[oprate - 1](number_a, number_b)

版本進化

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