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hello.c .c

#include int main () { printf("Hello World"); return 0; } : .

, ? , ! Build Compile Current File-

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, Hello World Process

returned 0 (0x0) ( ) execution time : 0.031 s 0.031 , Press any key to continue. -Any key Hello World

http://www.youtube.com/watch?v=ybcQ04WeuUI&feature=player_embedded

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int main() {

return 0; }

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printf("Hello World");-

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#include

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size in spaces 4

: I love my country,

Bangladesh

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, , ? ! , = , , #include int main() { int a; int b; int sum; a = 50; b = 60; sum = a + b; printf("Sum is %d", sum); return 0; } : .

, : Sum is 110

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printf "Sum is %d" Sum is %d- sum %d- sum- %d , , , ,

:#include int main() { int a, b, sum; a = 50;

b = 60; sum = a + b; printf("Sum is %d", sum); return 0; } : .

:#include int main() { int a = 50, b = 60, sum; sum = a + b; printf("Sum is %d", sum); return 0; } : .

?#include int main() { int x, y; x = 1; y = x; x = 2; printf("%d", y); return 0;

} : .

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:#include int main() { int a = 50, b = 60, sum; sum = a + b; printf("%d + %d = %d", a, b, sum); return 0; } : .

? printf("%d + %d = %d", a, b, sum); printf("%d + %d = %d", b, a, sum);

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-, , , int ( real number) , ?#include int main() { int a = 50.45, b = 60, sum; sum = a + b; printf("%d + %d = %d", a, b, sum); return 0; } : .

a- 50.45 , , main return 0; ? return 0;

: 50 + 60 = 110

a- 50 , 50.45 (type cast) double double int- , : int a = (int) 50.45

int a = 50.99; a- 50 int a = -50.9; a- -50 double int-

, #include

int main() { int n; double x; x = 10.5; n = (int)x; printf("Value of n is %d\n", n); printf("Value of x is %lf\n", x); return 0; } : .

x- - double , %lf (l L)

int ? :#include int main() { int a; a = 1000; printf("Value of a is %d", a); a = -21000; printf("Value of a is %d", a); a = 10000000; printf("Value of a is %d", a);

a = -10000000; printf("Value of a is %d", a); a = 100020004000503; printf("Value of a is %d", a); a = -4325987632; printf("Value of a is %d", a); return 0; } : .

a- ? printf- printf : printf("Value of a is %d\n", a); printf ""- \n

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(real number) , , ... -3, -2, -1, 0, 1, 2, 3 ... 5, -3, -2.43, 0, 0.49, 2.92 ( )#include int main() { double a, b, sum;

a = 9.5; b = 8.743; sum = a + b; printf("Sum is: %lf\n", sum); printf("Sum is: %0.2lf\n", sum); return 0; } : .

:

Sum is: 18.243000 Sum is: 18.24

%lf , %0.2lf ( %0.3lf , %0.0lf) double 64 1.7E-308 (1.7 x 10-308) 1.7E+308 (1.7 x 10308) ,

, , ( ) scanf (- ) :#include int main() { int a, b, sum; scanf("%d", &a); scanf("%d", &b);

sum = a + b; printf("Sum is: %d\n", sum); return 0; } : .

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scanf scanf("%d", &a); %d scanf- int ( ) a- (&) , &a a , &a- , a b- scanf : scanf("%d %d", &a, &b); & ? , , #include int main() { int a, b, sum; scanf("%d", &a); scanf("%d", b); sum = a + b; printf("Sum is: %d\n", sum); return 0; } : .

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printf("Enter the first letter of your name: "); scanf("%c", &ch); printf("The first letter of your name is: %c\n", ch); return 0; } : .

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int main() { char ch; printf("Enter the first letter of your name: "); ch = getchar(); printf("The first letter of your name is: %c\n", ch); return 0; } : .

getchar ch char : char c = 'A';

:#include int main() { int num1, num2; printf("Please enter a number: "); scanf("%d", &num1); printf("Please enter another number: "); scanf("%d", &num2); printf("%d + %d = %d\n", num1, num2, num1+num2); printf("%d - %d = %d\n", num1, num2, num1-num2); printf("%d * %d = %d\n", num1, num2, num1*num2); printf("%d / %d = %d\n", num1, num2, num1/num2); return 0;

} : .

, , num1 num2- , , , printf , num2- 0 printf +, -, *, / char :#include int main() { int num1, num2, value; char sign; printf("Please enter a number: "); scanf("%d", &num1); printf("Please enter another number: "); scanf("%d", &num2); value = num1 + num2; sign = '+'; printf("%d %c %d = %d\n", num1, sign, num2, value); value = num1 - num2; sign = '-'; printf("%d %c %d = %d\n", num1, sign, num2, value); value = num1 * num2; sign = '*'; printf("%d %c %d = %d\n", num1, sign, num2, value); value = num1 / num2;

sign = '/'; printf("%d %c %d = %d\n", num1, sign, num2, value); return 0; } : .

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(comment) // /* */ #include int main() { // test program - comment 1 printf("Hello "); /* We have printed Hello, now we shall print World. Note that this is a multi-line comment */ printf("World"); // printed world return 0; } : .

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[ ] ' '! - #include int main() { int n; n = 10; if(n >= 0) { printf("The number is positive\n"); } else { printf("The number is negative\n"); } return 0; } : .

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, ? ' ' >= ' '- - if else- if else , ( ) :#include int main() { int n; n = 10; if(n < 0) { printf("The number is negative\n"); }

else { printf("The number is positive\n"); } return 0; } : .

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, :#include int main() { int n = 10; if(n < 0) { printf("The number is negative\n"); } else if (n > 0) { printf("The number is positive\n"); } else if (n == 0) { printf("The number is zero!\n"); } return 0; }

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, , n- #include int main() { int n = 10; if(n < 0) { printf("The number is negative\n"); } else if (n > 0) { printf("The number is positive\n"); } else { printf("The number is zero!\n"); } return 0; } : .

if else else if , :#include int main() { int number = 12; if(number > 10) { printf("The number is greater than ten\n"); } return 0; } : .

?#include int main() { int n = 10; if (n < 30) { printf("n is less than 30.\n"); } else if(n < 50) { printf("n is less than 50.\n"); } return 0;

} : .

: n is less than 30. else if(n < 50) if (n < 30) , else if else , #include

int main()

{

int n = 10;

if (n < 30) {

printf("n is less than 30.\n");

}

if(n < 50) {

printf("n is less than 50.\n");

}

return 0;

}

: .

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: int number; number- : number = 5; number 2 : remainder = number % 2; if- remainder- remainder- 0 1 :#include int main() { int number, remainder; number = 5; remainder = number % 2; if(remainder == 0) { printf("The number is even\n"); } else { printf("The number is odd\n"); } return 0;

} : .

remainder :#include int main() { int number = 9; if(number % 2 == 0) { printf("The number is even\n"); } else { printf("The number is odd\n"); } return 0; } : .

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(small letter lower case letter) (capital letter upper case letter), character 26 lower case letter 26 upper case letter- , , char ch = 'p'; if (ch == 'a')

{ printf("%c is lower case\n", ch); } else if (ch == 'A') { printf("%c is upper case\n", ch); } else if (ch == 'b') { printf("%c is lower case\n", ch); } else if (ch == 'B') { printf("%c is upper case\n", ch); } else if (ch == 'c') { printf("%c is lower case\n", ch); } else if (ch == 'C') { printf("%c is upper case\n", ch); }

(AND operator) '&&'

#include int main() { char ch = 'W'; if(ch >= 'a' && ch = 'A' && ch = 'a' && ch = 'a' ch = 'a' && ch = 'A' && ch = 1 || num = 1) (n = 'a' && ch