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What’s the difference between using the % and the %% in the C language?
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The symbol % is used in data input and output functions such as printf() and scanf(). When using this symbol indicates that what comes next is something special that has a meaning of how the data should be formatted.
For example %d indicates that the data must be an integer value, or %s must be a string. Without the symbol it would be just a letter to be used normally without a special meaning. It is more or less like the \n which means it’s to skip a line, without the backslash it would just be a letter n.
Just as \\ means he just wants a backslash, %% means he just wants a percentage symbol. Because think about it, if this symbol indicates that it is special, when you want it to stop being special you have to have a different way of using it, then the first symbol says that there is something special to follow and what comes after it is another symbol equal, then especially, it treats that symbol as a normal character to be used in the text used.
#include <stdio.h>
int main(void) {
printf("Strings:\n");
const char* s = "Hello";
printf("\t.%10s.\n\t.%-10s.\n\t.%*s.\n", s, s, 10, s);
printf("Characters:\t%c %%\n", 65); //olha o duplo aqui, veja o resultado
printf("Integers\n");
printf("Decimal:\t%i %d %.6i %i %.0i %+i %i\n", 1, 2, 3, 0, 0, 4, -4);
printf("Hexadecimal:\t%x %x %X %#x\n", 5, 10, 10, 6);
printf("Octal:\t%o %#o %#o\n", 10, 10, 4);
printf("Floating point\n");
printf("Rounding:\t%f %.0f %.32f\n", 1.5, 1.5, 1.3);
printf("Padding:\t%05.2f %.2f %5.2f\n", 1.5, 1.5, 1.5);
printf("Scientific:\t%E %e\n", 1.5, 1.5);
printf("Hexadecimal:\t%a %A\n", 1.5, 1.5);
}
Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.
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There is something like the arroba before the strings in C# in C?
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Not in standard C.
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If you’re talking about printf or scanf. Here’s a table to help you better:
printf ("Teste %% %%") // "Teste % %"
printf ("%f",40.345) // "40.345"
printf ("Um caractere %c e um inteiro %d",'D',120) // "Um caractere D e um inteiro
120"
printf ("%s e um exemplo","Este") // "Este e um exemplo"
printf ("%s%d%%","Juros de ",10) // "Juros de 10%"
At another point % also picks up the rest of a division:
The % operator returns the rest of the division of a number by another.
5 % 2 = 1
4 % 2 = 0
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Thank you all very much
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