### 5.1.140 sprintf

Procedure from library `standard.lib` (see standard_lib).

Syntax:
  `sprintf (` string_expression `[,` any_expressions `] )`

Return:
  string

Purpose:
  `sprintf(fmt,...);` performs output formatting. The first argument is a format control string. Additional arguments may be required, depending on the content of the control string. A series of output characters is generated as directed by the control string; these characters are returned as a string.
  The control string `fmt` is simply text to be copied, except that the string may contain conversion specifications.
  Type `help print;` for a listing of valid conversion specifications. As an addition to the conversions of `print`, the `%n` and `%2` conversion specification does not consume an additional argument, but simply generates a newline character.

Note:
  If one of the additional arguments is a list, then it should be wrapped in an additional `list()` command, since passing a list as an argument flattens the list by one level.

Example:

      ring r=0,(x,y,z),dp;
    module m=[1,y],[0,x+z];
    intmat M=betti(mres(m,0));
    list l = r, m, M;
    string s = sprintf("s:%s,%n l:%l", 1, 2); s;
    ==> s:1,
    ==>  l:int(2)
    s = sprintf("s:%n%s", l); s;
    ==> s:
    ==> (0),(x,y,z),(dp(3),C)
    s = sprintf("s:%2%s", list(l)); s;
    ==> s:
    ==> (0),(x,y,z),(dp(3),C),y*gen(2)+gen(1),x*gen(2)+z*gen(2),1,1
    s = sprintf("2l:%n%2l", list(l)); s;
    ==> 2l:
    ==> list("(0),(x,y,z),(dp(3),C)",
    ==> module(y*gen(2)+gen(1),
    ==> x*gen(2)+z*gen(2)),
    ==> intmat(intvec(1,1 ),1,2))
    ==>
    s = sprintf("%p", list(l)); s;
    ==> [1]:
    ==>    //   characteristic : 0
    ==> //   number of vars : 3
    ==> //        block   1 : ordering dp
    ==> //                  : names    x y z
    ==> //        block   2 : ordering C
    ==> [2]:
    ==>    _[1]=y*gen(2)+gen(1)
    ==>    _[2]=x*gen(2)+z*gen(2)
    ==> [3]:
    ==>    1,1
    s = sprintf("%;", list(l)); s;
    ==> [1]:
    ==>    //   characteristic : 0
    ==> //   number of vars : 3
    ==> //        block   1 : ordering dp
    ==> //                  : names    x y z
    ==> //        block   2 : ordering C
    ==> [2]:
    ==>    _[1]=y*gen(2)+gen(1)
    ==>    _[2]=x*gen(2)+z*gen(2)
    ==> [3]:
    ==>    1,1
    ==>
    s = sprintf("%b", M); s;
    ==>            0     1
    ==> ------------------
    ==>     0:     1     1
    ==> ------------------
    ==> total:     1     1
    ==>

See also: fprintf; print; printf; string.

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