1、 设计一个字符串数组的统计工具，可以实现以下功能：（1） 统计所有大写字母的个数；（2） 统计所有小写字母的个数；（3） 将所有字母转换为大写字母；（4） 将所有字母转换为小写字母。#include #include #include void main()char c100, b100;unsigned uc, i, cnt;coutPlease input a string:endl;gets(c);docoutendl;coutThe original string is cendl;coutendl;cout* String Tool *endl;cout1. Count uppercase letters.endl;cout2. Count lowercase letters.endl;cout3. Change all letters to uppercase.endl;cout4. Change all letters to lowercase.endl;cout0. Exituc;coutendl;switch(uc)case 1:cnt=0;for (i=0; i=A & ci=Z)cnt+;coutThe number of uppercase letters in string c is: cntendl;break;case 2:cnt=0;for (i=0; i=a & ci=z)cnt+;coutThe number of lowercase letters in string c is: cntendl;break;case 3:for (i=0; i=a & ci=z)bi-=32;coutThe original string cendl;coutAfter changing all letters to uppercase, it turns to bendl;break;case 4:for (i=0; i=A & ci=Z)bi+=32;coutThe original string cendl;coutAfter changing all letters to lowercase, it turns to bendl;coutendl;while (uc);2、 实现一个32的矩阵和23的矩阵相乘，输出计算结果。计算方式如下：#include void main()int a32, b23, c33, i, j;coutPlease input 3X2 matrix a:endl;for(i=0; i3; i+)for(j=0; j2; j+)coutaijaij;coutendl;coutMatrix a is:endl;for(i=0; i3; i+)for(j=0; j2; j+)coutaijt;coutendl;coutendl;coutPlease input 2X3 matrix b:endl;for(i=0; i2; i+)for(j=0; j3; j+)coutbijbij;coutendl;coutMatrix b is:endl;for(i=0; i2; i+)for(j=0; j3; j+)coutbijt;coutendl;coutendl;coutThe product matrix is:endl;for(i=0; i3; i+)for(j=0; j3; j+)cij=ai0*b0j+ai1*b1j;coutcijt;coutendl;coutendl;3、 从键盘输入10个整数，使用选择排序法输出这10个整数升序排列的结果。#include void main()int i,j, t, a10;coutPlease input 10 numbers:endl;for(i=0; i10; i+)coutaiai;coutThe original order is:endl;for(i=0; i10; i+)coutait;coutendl;for(i=0; i9; i+)for(j=i+1; jaj)t=ai; ai=aj; aj=t;coutThe sorted order is:endl;for(i=0; i10; i+)coutait;coutendl;4、 在一个多维数组中记录10个同学的学号和姓名，提供2种查找方式：（1）通过输入学号查找对应的姓名；（2）通过输入姓名查找对应的学号。学号和姓名的多维数组表示如下：学号姓名101Tom102John110Mary解法一#include #include void main()char c1128=000,No,101,Tom,102,John,103,Jerry,104,Jim,105,Mike,106,Tim,107,Bob,108,David,109,Edward,110,Fred;int i,ch;char t8;coutNumbertNameendl;for(i=1; i=10; i+)coutci0tci1endl; /打印学号和姓名coutendl;docout* Look up *endl;cout1. Find name based on numberendl;cout2. Find number based on nameendl;cout0. Exitch;switch(ch)case 0: break;case 1:docoutPlease input the number, quit with 000:t;if(strcmp(t, 000)=0)break;for(i=1; i=10; i+)if(strcmp(t, ci0)=0)coutThe name of number t is: ci110)coutSorry, no such number!endl;while(true);break;case 2:docoutPlease input the name, quit with No:t;if(strcmp(t, No)=0)break;for(i=1; i=10; i+)if(strcmp(t, ci1)=0)coutThe number of name t is: ci010)coutSorry, no such name!endl;while(true);break;default:coutIllegal choice!endl;while(ch);解法二#include #include void main()char c1228=000,No,101,Tom,102,John,103,Jerry,104,Jim,105,Mike,106,Tim,107,Bob,108,David,109,Edward,110,Fred,number,name;int i,ch;char t8;coutNumbertNameendl;for(i=1;