我正在做一门逐位算术的课程(即任何大小的数字的算术)。
我有这个在运行时崩溃的 for 循环,并抱怨“列”为空。任何人都可以对此有所了解吗?
for(column=0; column < bigger.length; column++) {
NSLog(@"column %@", column);
workingDigit = [y intAt:column] + [self intAt:column] + carry;
carry = workingDigit / 10; //make the carry not include the last digit of the sum
workingDigit = workingDigit % 10; //make the digit not include the carry
[result insertString:[NSString stringWithFormat:@"%d", workingDigit] atIndex:0];
}
顺便说一句,列是一个 int,声明为实例变量。此外,该 NSLog 打印出“列(空)”