Third time job

1. Character JudgmentEnter a character to determine if it is lowercase letter output its corresponding uppercase letter, if it is uppercase letters output its corresponding lowercase, if the digital output number itself, if it is a space, output "space", if not the case, output "other".

#include <stdio.h>intMain () {Charx; scanf ("%c",&x); if(x>='a'&&x<='Z') {x=x- +; printf ("%c", x); }    Else if(x>='A'&&x<='Z') {x=x+ +; printf ("%c", x); }    Else if(x>='0'&&x<='9') {printf ("%c", x); }    Else if(x=' ') {printf ("Space"); }    Else{printf (" Other"); }return 0;}

2. Age issuesEnter a student's birthday (year: Month: Day), and enter the current date (year: Month: Day) to calculate the actual age of the students (years old)

#include <stdio.h>intMain () {inta,b,c,d,e,f,g; printf ("Please enter the student's birthday"); scanf ("%d%d%d",&a,&b,&c); printf ("Please enter today's date"); scanf ("%d%d%d",&d,&e,&f); if((b==e&&c<=f) | | b<e) {g=d-A; printf ("%d", G); }    Else if(b==e&&c>f) {g=d-a-1; printf ("%d", G); }    Else{g=d-a-1; printf ("%d", G); }    return 0;}

3. Judging the type of triangleenter three integers to determine the type of triangle (equilateral triangle, isosceles triangle, isosceles right triangle, right triangle, general triangles, and non-triangles)

#include <stdio.h>intMain () {intA,b,c; printf ("Please enter a three integer"); scanf ("%d%d%d",&a,&b,&c); if(a+b<c| | A-b>c) {printf ("Non-triangular"); }    Else if(a==b&&b==c&&a==c) {printf ("equilateral triangle"); }    Else if((a==b&&a*a+b*b==c*c) | | (a==c&&a*a+c*c==b*b) | | c==b&&c*c+b*b==a*a) {printf ("isosceles Right Triangle"); }    Else if((a==b&&a*a+b*b!=c*c) | | (a==c&&a*a+c*c!=b*b) | | c==b&&c*c+b*b!=a*a) {printf ("isosceles Triangle"); }    Else if((a*a+b*b==c*c) | | (a*a+c*c==b*b) | | c*c+b*b==a*a) {printf ("Right Triangle"); }    Else{printf ("General Triangles"); }return 0;} 

4. See commodity guessing price games

#include <stdio.h>#include<stdlib.h>#include<time.h>intMain () {intb; printf ("Please enter an integer"); scanf ("%d",&a);    Srand (Time (NULL)); b=rand ()% -+1; if(a>b) {printf ("you guessed the price was too big."); }    Else if(a<b) {printf ("you guessed the price was too small."); }    Else{printf ("you guessed right."); } printf ("This number is%d .", B); return 0;}

Experiment Summary:

Characters with single quotation marks;

Symbolic constants with Char;

Note the difference between%d and%c

Summary of Knowledge points:

The assignment is = and equals = = =

If after without semicolons

Third time job