C++循环语句

循环可以用while,do,for,goto语句表述

    while (condition) statement;

    do statement while(condition);

    for (for-init-statement; condition; expression) statement;

    goto identifier;

     identifier: statement;

while语句代码段

int a = 0;
while( a > 0 )
{
    a--;
}

do语句代码段

int a = 0;
do 
{
    a--;
}
while( a > 0 );

for语句代码段

int sum = 0;
int i;

for( i=1; i <= 100;i++)
{
    sum += i;
}

goto语句

int i, j;

for ( i = 0; i < 10; i++ )
{
    printf( "Outer loop executing. i = %d\n", i );
for ( j = 0; j < 2; j++ )
    {
        printf( " Inner loop executing. j = %d\n", j );
if ( i == 3 )
goto stop;
    }
}

// This message does not print: 
printf( "Loop exited. i = %d\n", i );

stop: 
printf( "Jumped to stop. i = %d\n", i );