c - 功能如何搭配？

Question

nrOfMeasurements 应该相当于“用户输入多少个元素”来创建新函数(需要)。当我尝试编译时，出现 intmeasurements_count = getEnter(measurements, LENGTH); 错误，如何修复？

int getEnter(int measurements[COLUMN][LENGTH]){
        int x;
        for(x=0;x<LENGTH;x++){
            printf("Enter number #%d: ", x+1);
            scanf("%d", &measurements[COLUMN][x]);

            if(measurements[COLUMN][x]==0){
                break;
            }
        }
        return x;
    }

void nrOfMeasurements(){
        int measurements_count = getEnter(measurements, LENGTH);

        return;
    }

Answer 1

错误是由于第二个函数造成的:

void nrOfMeasurements(){
        int measurements_count = getEnter(measurements, LENGTH);

        return;
    }

引用了变量“measurements”，但是该特定变量未在函数范围内定义。

因此出现错误:

.labo2.c:21:36: error: use of undeclared identifier 'measurements' int measurements_count = getEnter(measurement..

>如何解决？

measurements 必须在函数可用的范围内定义。例如:

void nrOfMeasurements(){
        int measurements[COLUMN][LENGTH];
        int measurements_count = getEnter(measurements, LENGTH);

        return;
    }

或者，也许measurements可以是一个全局变量:

int measurements[COLUMN][LENGTH];

void nrOfMeasurements(){
        int measurements_count = getEnter(measurements, LENGTH);

        return;
    }

或者，也许测量可以是函数的参数:

        void nrOfMeasurements(int measurements[COLUMN][LENGTH]){
        int measurements_count = getEnter(measurements, LENGTH);

        return;
    }