Third time job

1.


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

2.

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

3.

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

4.

#include <stdio.h>#include<stdlib.h>#include<time.h>intMain () {intb; printf ("Please enter the price"); scanf ("%d",&a);    Srand (Time (NULL)); b=rand ()% -+1; if(a> -|| a<0) {printf ("Please re-enter"); }    Else if(a<b) {printf ("guess it's low, it should be%d.", B); }    Else if(a==b) {printf ("Congratulatins"); }    Else{printf ("guess it's high, it should be%d.", B); }    return 0;}

Experiment Summary: Before writing the code, must adjust the good order

At the time of writing, remember what that variable means.

Learned a new function

&& | | Or did not make a quick distinction.

Summary of Knowledge points: Do not add semicolons after the IF statement;

To understand the usage of%d and%c

Third time job