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1、将包含字符数字的字符串分开, 使得分开后的字符串前一部分是数字后一部分是字母。例如“h1ell2o3”->”123hello”

#include 
   
    #include 
    
     #include 
     
      void divide_str(char* str1, char* str2);int main() {
   	char c[50] = {
   0};	char a[50] = {
   0};	printf("请输入字符串：\n");	while (gets(c) != NULL) {
   		divide_str(c, a);	}	return 0;}void divide_str(char* str1, char* str2) {
   	if (str1 == NULL || str2 == NULL) {
   		return;	}	int len = strlen(str1);	int j = 0;	for (int i = 0; i < len; i++) {
   		if (str1[i] >= '0' && str1[i] <= '9') {
   			str2[j] = str1[i];			j++;		}	}	for (int i = 0; i < len; i++) {
   		if (isalpha(str1[i])) {
   			str2[j] = str1[i];			j++;		}	}	printf("转化后的字符串顺序为：\n");	puts(str2);}
     
    
   

2.将字符串中的空格替换成“ % 020”

#include 
   
    void print_str(char* str) {
   	if (str == NULL) {
   		return;	}	int i = 0;	int j = 0;	char word[50] = {
    0 };	while (str[i]) {
   		if (str[i] == ' ') {
   			printf("%s", word);			printf("%s", "%020");			memset(word, 0, sizeof(word));			j = 0;			i++;		}		else {
   			word[j] = str[i];			i++;			j++;		}	}	puts(word);}int main() {
   	char str[50] = {
   0};	puts("请输入一行字符串：");	while (gets(str) != NULL) {
   		print_str(str);		puts("请再次输入一行字符串：");	}	return 0;}
   

3、删除字符串中指定的字符。例如“abcdaefaghiagkl“删除‘a’, 以后:“bcdefghigkl”

#include 
   
    void delete_char(char* str) {
   	if (str == NULL) {
   		return;	}	char word[50] = {
   0};	char a = '\0';	int i = 0, j = 0;	puts("please input need to deleted char:");	scanf("%c", &a);	while (str[i]) {
   		if (str[i] != a) {
   			word[j] = str[i];			j++;		}		i++;	}	printf("%s\n", word);}int main() {
   	char c[50] = {
   0};	printf("input str:\n");	while (gets(c) != NULL) {
   		delete_char(c);		printf("input str again:\n");		getchar();	}}
   

4、删除一个数组中重复的元素。例如 1,2,2,2,3,3,3,4,4,5,5,5,6,6,6 -> 1,2,3,4,5,6

#define _CRT_SECURE_NO_WARNINGS#include 
   
    void delete_num(char* num) {
   	if (num == NULL) {
   		return;	}	char c[50] = {
    0 };	int i = 0, j = 0;	int len = strlen(num);	while(i < len) {
   		if (num[i] != num[i + 1]) {
   			c[j] = num[i];			i++;			j++;		}		else {
   			i++;		}	}	puts(c);}int main() {
   	char num[50];	while (gets(num) != NULL) {
   		delete_num(num);	}	return 0;}
   

5、将字符串中的相邻的多余空格去掉，例如（空格用下划线表示）： __hello____world___how_are_you -> hello_world_how_are_you

#define _CRT_SECURE_NO_WARNINGS#include 
   
    void delete_blank(char* str) {
   	if (str == NULL) {
   		return;	}	int i = 0;	int j = 0;	char word[50] = {
    0 };	while (str[i]) {
   		if (str[i] == ' ') {
   			i++;		}		else if (str[i] != ' '){
   			word[j] = str[i];			i++;			j++;			if (str[i] == ' ') {
   				printf("%s ", word);				memset(word, 0, sizeof(word));				j = 0;				i++;			}		}	}	puts(word);}int main() {
   	char c[50] = {
   0};	while (gets(c) != NULL) {
   		delete_blank(c);	}	return 0;}
   

6、大整数加法,实现任意范围的两个整数的加法（ 整数的范围用 int 型的变量无法表示,50位）

#define _CRT_SECURE_NO_WARNINGS#include 
   
    #include 
    
     void reserve_str(int* str, int len);void add_big_int(int* a, int* b, int len1, int len2) {
   	int k = 0, t = 0;	int count = 0;            //记录计算结果数字的位数	if (len1 > len2) {
           //第一个数长度大于第二个数		while (t <= len1 - 1) {
   			k = a[t] + b[t];			if (k < 10) {
   				a[t] = a[t] + b[t];			}			else {
   				a[t] = k % 10;				a[t + 1] = a[t + 1] + (k - a[t]) / 10;			}			t++;		}		if (a[t] != 0 && a[t] > 0) {
   			count = t + 1;		}		else {
   			count = t;		}	}	else {
                             		while (t <= len2 - 1) {
   			k = a[t] + b[t];			if (k < 10) {
   				a[t] = a[t] + b[t];			}			else {
   				a[t] = k % 10;				a[t + 1] = a[t + 1] + (k - a[t]) / 10;			}			t++;		}		if (a[t] != 0 && a[t] > 0) {
   			count = t + 1;		}		else {
   			count = t;		}	}	printf("超大数字A和B的和为：\n");	count--;	while (count >= 0) {
   		printf("%d", a[count]);		count--;	}	printf("\n");}void reserve_str(int* str, int len) {
   	int start = 0;	char c = 0;	while (start < len) {
   		c = str[start];		str[start] = str[len - 1];		str[len - 1] = c;		start++;		len--;	}	return;}int main() {
   	int c[100] = {
    0 };	int a[100] = {
    0 };	char data;	int i = 0, j = 0;	printf("请输入一个超大数字A（超过50个字节）：\n");	while ((data = getchar()) != '\n'){
   		c[i++] = data - 48;	}	reserve_str(c, i);	printf("请输入一个超大数字B（超过50个字节）：\n");	while ((data = getchar()) != '\n') {
   		a[j++] = data - 48;	}	reserve_str(a, j);	add_big_int(c, a, i, j);	return 0;}
    
   

7、求一个字符串数组的最大值和次大值

#include 
   
    #include 
    
     void big(char* arr[], int size, char** big1, char** big2);int main() {
   	char* arr[5] = {
   "wuhan", "hello","word","dwdeedef","15646959" };	char* max = arr[0];   //最大字符串和次大字符串的指针	char* c_max = arr[1];  	big(arr, 5, &max, &c_max);	return 0;}void big(char* arr[], int size, char** big1, char** big2) {
   	for (int i = 1; i < size; ++i) {
   		if (strcmp(*big1, arr[i]) < 0) {
         //当前字符串大于最大字符串			*big2 = *big1;			*big1 = arr[i];		}		else if (strcmp(*big2, arr[i]) < 0) {
        //当前字符串大于次大字符串			*big2 = arr[i];		}	}	puts("最大字符串：");	puts(*big1);	puts("次大字符串：");	puts(*big2);}
    
   

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