continue
– 跳出本次循环,继续执行接下来的循环break
– 跳出循环(或跳出代码块)
break 示例
pragma solidity ^0.5.0;
contract SolidityTest {
uint storedData;
constructor() public{
storedData = 10;
}
function getResult() public view returns(string memory){
uint a = 1;
uint b = 2;
uint result = a + b;
return integerToString(result);
}
function integerToString(uint _i) internal pure
returns (string memory) {
if (_i == 0) {
return "0";
}
uint j = _i;
uint len;
while (true) {
len++;
j /= 10;
if(j==0){
break; // break 语句跳出循环
}
}
bytes memory bstr = new bytes(len);
uint k = len - 1;
while (_i != 0) {
bstr[k--] = byte(uint8(48 + _i % 10));
_i /= 10;
}
return string(bstr);
}
}
可以参考Solidity – 第一个程序中的步骤,运行上述程序。
输出
0: string: 3
continue 示例
pragma solidity ^0.5.0;
contract SolidityTest {
uint storedData;
constructor() public{
storedData = 10;
}
function getResult() public view returns(string memory){
uint n = 1;
uint sum = 0;
while( n < 10){
n++;
if(n == 5){
continue; // 当n的和是5时,跳过n。
}
sum = sum + n;
}
return integerToString(sum);
}
function integerToString(uint _i) internal pure
returns (string memory) {
if (_i == 0) {
return "0";
}
uint j = _i;
uint len;
while (true) {
len++;
j /= 10;
if(j==0){
break; // break跳出循环
}
}
bytes memory bstr = new bytes(len);
uint k = len - 1;
while (_i != 0) {
bstr[k--] = byte(uint8(48 + _i % 10));
_i /= 10;
}
return string(bstr);
}
}
可以参考Solidity – 第一个程序中的步骤,运行上述程序。
输出
0: string: 49