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There are a few methods you can use to keep a one-line code expression in C++ from being separated into multiple lines by VS Code:

1. Use the backslash () character at the end of the line to indicate that the expression continues on the next line:

int sum = 1 + 2 \
          + 3 + 4;

1. Use parentheses to group the expression:

int sum = (1 + 2
          + 3 + 4);

1. Use the backslash and parentheses together:

int sum = (1 + 2 \
          + 3 + 4);

1. Increase the width of the text editor window to allow for longer lines.