gfortran Linux字符串处理如何进行

在Linux系统下，使用gfortran编译器进行Fortran程序开发时，可以通过以下方法进行字符串处理：

1. 字符串拼接：

program main     character(len=20) :: str1, str2, result_str      str1 = "Hello, "     str2 = "World!"     result_str = str1 // str2      print *, result_str end program main 

2. 字符串长度：

program main     use iso_fortran_env, only: int32     implicit none     character(len=20) :: str     integer(int32) :: str_length      str = "Hello, World!"     str_length = len_trim(str)      print *, "String length: ", str_length end program main 

3. 字符串比较：

program main     character(len=20) :: str1, str2     logical :: is_equal      str1 = "Hello, World!"     str2 = "Hello, World!"     is_equal = str1 == str2      print *, "Strings are equal: ", is_equal end program main 

4. 字符串截取：

program main     character(len=20) :: str, substr      str = "Hello, World!"     substr = str(1:5)      print *, "Substring: ", substr end program main 

5. 字符串查找：

program main     use iso_fortran_env, only: int32     implicit none     character(len=20) :: str, target     integer(int32) :: pos      str = "Hello, World!"     target = "World"     pos = index(str, target)      print *, "Position of target: ", pos end program main 

6. 字符串替换：

program main     character(len=20) :: str, old_substr, new_substr, result_str     integer :: pos      str = "Hello, World!"     old_substr = "World"     new_substr = "Fortran"      pos = index(str, old_substr)     if (pos > 0) then         result_str = str(1:pos-1) // new_substr // str(pos+len(old_substr):)     else         result_str = str     end if      print *, "Replaced string: ", result_str end program main 

这些示例展示了如何在Linux系统下使用gfortran编译器进行基本的字符串处理。你可以根据需要修改和扩展这些代码来满足你的实际需求。