问题描述
巧合的是，我发现disp(fprintf())打印出fprintf的字符串及其所包含的字符数.我知道disp()是多余的，但是出于纯粹的好奇心，我想知道为什么它打印字符数，因为这一天实际上可能会有所帮助.
例如
By coincidence I discovered, that disp(fprintf()) prints the string of fprintf plus the number of characters that it has. I know, that the disp() is reduntant, but just out of pure curiosity I want to know, why it prints the number of characters, since this might be actually helpful one day.
For example
disp(fprintf('Hi %i all of you',2))
产生
推荐答案
问题中提到的特定行为的原因是对FILEprintf的调用，带有存储变量:
The reason for the specific behaviour mentioned in the question is the call to FILEprintf fprintf with a storage variable:
所以发生的情况是disp(fprintf(...))首先按照fprintf打印文本，但没有存储变量，但是disp仅看到fprintf的存储变量，它是字符串的字节数，因此输出.
So what happens is that disp(fprintf(...)) first prints the text as per fprintf without a storage variable, but disp sees only the storage variable of fprintf, which is the number of bytes of your string, hence the output.
此外，如果要显示字符串，则需要STRINGprintf: sprintf :
As an addition, if you want to display strings, you need STRINGprintf: sprintf:
disp(sprintf('Hi %i all of you',2))
Hi 2 all of you
文档向我展示的是sprintf仅用于字符串格式化，您可以将其用于将图形添加到文本，设置顺序文件名等，而fprintf则可以写入文本文件.
What the docs show me is that sprintf is exclusively used for string formatting, which you can use for adding text to a graph, setting up sequential file names etc, whilst fprintf writes to a text file.
fprintf(fileID,formatSpec,A1,...,An)按列顺序将formatSpec应用于数组A1，... An的所有元素，并将数据写入文本文件. fprintf使用对fopen的调用中指定的编码方案.
fprintf(fileID,formatSpec,A1,...,An) applies the formatSpec to all elements of arrays A1,...An in column order, and writes the data to a text file. fprintf uses the encoding scheme specified in the call to fopen.
fprintf(formatSpec,A1,...,An)格式化数据并在屏幕上显示结果.
fprintf(formatSpec,A1,...,An) formats data and displays the results on the screen.
用于在屏幕上显示文本，因此disp(sprintf())或fprintf是相等的，但是如果要将结果存储在字符串中，则必须使用sprintf，并且如果要将其写入文本文件，则必须使用fprintf.
For displaying text on screen therefore disp(sprintf()) or fprintf are equal, but if you want to store the results in a string you have to use sprintf and if you want to write it to a text file you have to use fprintf.
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