frequency of characters in a string in c++ | string handling in c/c++

Let me borrow your brain for one time! So good sir!

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Great Great video thank you!!!

int main (int argc, char** argv)
/( char str l100l equal "";
coutvv"Enter string";
gets(str);
int sum equal 0;
for(int i equal 97; ivequal 122; ipp) l( sum equal 0;
for (int j equal 0; jvsizeof(str); jpp) l(if ((int)strlil equal2 i) l(
sum equal sum p 1;
)I
)I
system("pause");
)I

how are you ensuring that there is not repition