c语言基础程序

4. Some Tests With switch-case :

A student’s letter grade is calculated according to the following schedule.Write a C program with switch that accepts a students numerical grade.and displays the letter grade.

Numerical grade letter grade

greater than or equal to 90 A less than 90 but greater than or equal to 80 B

less than 80 but greater than or equal to 70 C

less than 70 but greater than or equal to 60 D

less than 60 E

#include

main()

{

int marks,index;

printf("please input a mark\n");

scanf("%d",&marks);

index=marks/10;

switch(index)

{

case 10:

case 9:

printf("grade=A\n");

break;

case 8:

printf("grade=B\n");

break;

case 7:

printf("grade=C\n");

break;

case 6:

printf("grade=D\n");

break;

default:

printf("grade=E\n");

break;

}

}

1. Some Tests With if –else :

Write a program to determine whether a input number is greater than 100

and less than 200 and divisible by 7 or not,please print the appropriate

message on the screen.

Document the output for your report. You don't have to write all the

sections in the report. Just paste the program and its output in a word file.

#include

main()

{

int a;

printf("input a number\n");

scanf("%d",&a);

if(a>100&&a<200&&a%7==0)

printf("true");

else

printf("false");

}

3. Some Tests With getchar() and putchar:

Write a C program that can convert capital letter to lowercase.Example: input ‘A’,then the screen output ‘a’.

When you are sure your program is working correctly,use it to complete the following table.

main()

{

char ch;

printf("please input a char");

ch=getchar();

ch=ch+32;

putchar(ch);

}